support default_user_template on vault_ssh_secret_backend_role

[fairclothjm]

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Relates OR Closes #1616

Release note for CHANGELOG:

Support default_user_template on vault_ssh_secret_backend_role resource

Output from acceptance testing:

$ TESTARGS="--run TestAccSSHSecretBackendRole_template" make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test --run TestAccSSHSecretBackendRole_template -timeout 30m ./...
?   	github.com/hashicorp/terraform-provider-vault	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/cmd/coverage	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/cmd/generate	[no test files]
ok  	github.com/hashicorp/terraform-provider-vault/codegen	(cached) [no tests to run]
?   	github.com/hashicorp/terraform-provider-vault/generated	[no test files]
ok  	github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/decode	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/encode	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/alphabet	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/role	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/template	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/transformation	(cached) [no tests to run]
?   	github.com/hashicorp/terraform-provider-vault/helper	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/internal/consts	[no test files]
ok  	github.com/hashicorp/terraform-provider-vault/internal/identity/entity	(cached) [no tests to run]
?   	github.com/hashicorp/terraform-provider-vault/internal/identity/group	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/internal/identity/mfa	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/internal/pki	[no test files]
ok  	github.com/hashicorp/terraform-provider-vault/internal/provider	(cached) [no tests to run]
?   	github.com/hashicorp/terraform-provider-vault/schema	[no test files]
ok  	github.com/hashicorp/terraform-provider-vault/testutil	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/util	(cached) [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/vault	1.839s

[vinay-gopalan]

Looking great! Had some small questions and nits, but overall looks good 😄

[vinay-gopalan]

Looking good!

[vinay-gopalan]

LGTM! Thanks for adding the feature :)