provider/docker: Fix regression, 'cert_path' stop working

[mkuzmin]

Fix #10754. My patch in #10151 broke original TLS authentication approach.

By some reason DefaultFunc and ConflictsWith in schema do not work together.
This code worked correctly

"ca_material": &schema.Schema{
  Type:          schema.TypeString,
  Optional:      true,
  Default: "",
  ConflictsWith: []string{"cert_path"},
},

but this fails

"ca_material": &schema.Schema{
  Type:          schema.TypeString,
  Optional:      true,
  DefaultFunc:   schema.EnvDefaultFunc("DOCKER_CA_MATERIAL", ""),
  ConflictsWith: []string{"cert_path"},
},

Now I've just hardcoded the validations.

I could write an integration test, but it's quite hard to setup such environment - we'll need launching multiple hosts. If you have any examples or just ideas, please share.

[stack72]

Hi @mkuzmin

This LGTM! Thanks for the fast follow up here

Paul

[ghost]

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