Adds a mysql_user_password resource for securely managing MySQL passwords

[joestump]

What does this PR change?

For some reason #47 didn't stick. This re-PRs that work.

Example HCL

resource "mysql_user" "test" {
  user = "jdoe"
}
 resource "mysql_user_password" "test" {
  user    = "${mysql_user.test.user}"
  pgp_key = "keybase:joestump"
}

Test Output

MYSQL_ENDPOINT='127.0.0.1:3305' MYSQL_USERNAME='root' MYSQL_PASSWORD='tests' make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v  -timeout 120m
?   	github.com/terraform-providers/terraform-provider-mysql	[no test files]
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccDatabase
--- PASS: TestAccDatabase (0.08s)
=== RUN   TestAccDatabase_collationChange
--- PASS: TestAccDatabase_collationChange (0.11s)
=== RUN   TestAccGrant
--- PASS: TestAccGrant (0.16s)
=== RUN   TestAccUserPassword_basic
--- PASS: TestAccUserPassword_basic (0.62s)
=== RUN   TestAccUser_basic
--- PASS: TestAccUser_basic (0.15s)
=== RUN   TestAccUser_auth
--- PASS: TestAccUser_auth (0.05s)
=== RUN   TestAccUser_deprecated
--- PASS: TestAccUser_deprecated (0.09s)
PASS
ok  	github.com/terraform-providers/terraform-provider-mysql/mysql	1.469s

[davidji99]

typo: assinged

[davidji99]

do you also want to add the PR html url here?

[davidji99]

seems the majority of these changes are vendored files. other than that, looks good.

[joestump]

@davidji99 the encryption helper pulled in a few new dependencies. make dep now updates vendor/ using go mod.