Mark IaaS password as sensitive

[zulh-civo]

Closes #51

---

tf show output before this PR

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# civo_instance.my-test-instance:
resource "civo_instance" "my-test-instance" {
  cpu_cores          = 1
  created_at         = "0001-01-01 00:00:00 +0000 UTC"
  disk_gb            = 15
  firewall_id        = "c1ce01cf-5e01-4378-8f03-f93a45d31843"
  hostname           = "foo.com"
  id                 = "77728c16-40fc-4fa0-87a7-9cc2b50116c3"
  initial_password   = "X7TepMCRE5Y4"
  initial_user       = "civo"
  network_id         = "fb3cdfff-66ba-4048-9f37-8625237cbe67"
  notes              = "this is a note for the server"
  private_ip         = "192.168.1.11"
  public_ip          = "212.2.246.134"
  public_ip_required = "create"
  ram_mb             = 1024
  size               = "g3.k3s.xsmall"
  source_id          = "debian-10"
  source_type        = "diskimage"
  status             = "ACTIVE"
  tags               = [
      "nginx",
      "python",
  ]
  template           = "4204229c-510c-4ba4-ab07-522e2aaa2cf8"
}

# data.civo_instances_size.small:
data "civo_instances_size" "small" {
  id    = "terraform-20210812065529146100000001"
  sizes = [
      {
          cpu         = 1
          description = "Extra Small"
          disk        = 15
          name        = "g3.k3s.xsmall"
          ram         = 1024
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 1
          description = "Small"
          disk        = 15
          name        = "g3.k3s.small"
          ram         = 2048
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 2
          description = "Medium"
          disk        = 15
          name        = "g3.k3s.medium"
          ram         = 4096
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 4
          description = "Large"
          disk        = 15
          name        = "g3.k3s.large"
          ram         = 8192
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 6
          description = "Extra Large"
          disk        = 15
          name        = "g3.k3s.xlarge"
          ram         = 16384
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 8
          description = "2X Large"
          disk        = 15
          name        = "g3.k3s.2xlarge"
          ram         = 32768
          selectable  = true
          type        = "kubernetes"
      },
  ]

  filter {
      all      = false
      key      = "type"
      match_by = "exact"
      values   = [
          "kubernetes",
      ]
  }

  sort {
      direction = "asc"
      key       = "ram"
  }
}

# data.civo_template.debian:
data "civo_template" "debian" {
  id        = "terraform-20210812065529796300000002"
  templates = [
      {
          id      = "4204229c-510c-4ba4-ab07-522e2aaa2cf8"
          label   = ""
          name    = "debian-10"
          version = "10"
      },
  ]

  filter {
      all      = false
      key      = "name"
      match_by = "exact"
      values   = [
          "debian-10",
      ]
  }
}

---

tf show output after this PR

Show

# civo_instance.my-test-instance:
resource "civo_instance" "my-test-instance" {
  cpu_cores          = 1
  created_at         = "0001-01-01 00:00:00 +0000 UTC"
  disk_gb            = 15
  firewall_id        = "c1ce01cf-5e01-4378-8f03-f93a45d31843"
  hostname           = "foo.com"
  id                 = "661d8e92-4272-4d2f-b47d-96594abf8447"
  initial_password   = (sensitive value)
  initial_user       = "civo"
  network_id         = "fb3cdfff-66ba-4048-9f37-8625237cbe67"
  notes              = "this is a note for the server"
  private_ip         = "192.168.1.11"
  public_ip          = "212.2.241.167"
  public_ip_required = "create"
  ram_mb             = 1024
  size               = "g3.k3s.xsmall"
  source_id          = "debian-10"
  source_type        = "diskimage"
  status             = "ACTIVE"
  tags               = [
      "nginx",
      "python",
  ]
  template           = "4204229c-510c-4ba4-ab07-522e2aaa2cf8"
}

# data.civo_instances_size.small:
data "civo_instances_size" "small" {
  id    = "terraform-20210812070520186600000001"
  sizes = [
      {
          cpu         = 1
          description = "Extra Small"
          disk        = 15
          name        = "g3.k3s.xsmall"
          ram         = 1024
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 1
          description = "Small"
          disk        = 15
          name        = "g3.k3s.small"
          ram         = 2048
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 2
          description = "Medium"
          disk        = 15
          name        = "g3.k3s.medium"
          ram         = 4096
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 4
          description = "Large"
          disk        = 15
          name        = "g3.k3s.large"
          ram         = 8192
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 6
          description = "Extra Large"
          disk        = 15
          name        = "g3.k3s.xlarge"
          ram         = 16384
          selectable  = true
          type        = "kubernetes"
      },
      {
          cpu         = 8
          description = "2X Large"
          disk        = 15
          name        = "g3.k3s.2xlarge"
          ram         = 32768
          selectable  = true
          type        = "kubernetes"
      },
  ]

  filter {
      all      = false
      key      = "type"
      match_by = "exact"
      values   = [
          "kubernetes",
      ]
  }

  sort {
      direction = "asc"
      key       = "ram"
  }
}

# data.civo_template.debian:
data "civo_template" "debian" {
  id        = "terraform-20210812070520755100000002"
  templates = [
      {
          id      = "4204229c-510c-4ba4-ab07-522e2aaa2cf8"
          label   = ""
          name    = "debian-10"
          version = "10"
      },
  ]

  filter {
      all      = false
      key      = "name"
      match_by = "exact"
      values   = [
          "debian-10",
      ]
  }
}

Note:
Outputs above were from two different IaaS nodes