add password_policy to vault_database_secret_backend_connection

[joshRooz]

Description

This PR updates vault_database_secret_backend_connection resource so that we can specify a password_policy.

One observation I would like to bubble up - there's potential for drift to be introduced if a password policy is set and applied, then subsequently removed from the configuration. In that scenario, the resource will not actually reconcile the engine's configuration to a defined default. The next plan or apply will show drift that can only be resolved by the resource if a new password policy is specified.

I modeled the existing behavior defined for other resource arguments, but I would be interested in feedback on the use of d.Get in place of d.GetOk.

Checklist

• [x] Added CHANGELOG entry (only for user-facing changes)
• [x] Acceptance tests where run against all supported Vault Versions

Output from acceptance testing:

Only a subset of databases have been updated as part of the PR. I passed in the verbose argument to highlight which tests were updated. Only the tests that passed have been updated; tests that are skipped have not been changed.

$ make testacc TESTARGS='-run=^TestAccDatabaseSecretBackendConnection_\(postgresql\|mysql\)' | grep -v -E "testing: warning: no tests to run|^PASS$" 

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -v -count 1 -run=^TestAccDatabaseSecretBackendConnection_\(postgresql\|mysql\) -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]
?   	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/codegen	0.298s [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]
?   	github.com/hashicorp/terraform-provider-vault/internal/sync	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/schema	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/util/mountutil	[no test files]
ok  	github.com/hashicorp/terraform-provider-vault/internal/identity/entity	0.422s [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/internal/provider	0.742s [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/testutil	0.979s [no tests to run]
ok  	github.com/hashicorp/terraform-provider-vault/util	0.832s [no tests to run]
=== RUN   TestAccDatabaseSecretBackendConnection_postgresql_import
--- PASS: TestAccDatabaseSecretBackendConnection_postgresql_import (1.15s)
=== RUN   TestAccDatabaseSecretBackendConnection_mysql_cloud
    resource_database_secret_backend_connection_test.go:448: "MYSQL_CLOUD_CONNECTION_URL" must be set
--- SKIP: TestAccDatabaseSecretBackendConnection_mysql_cloud (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_mysql
--- PASS: TestAccDatabaseSecretBackendConnection_mysql (2.61s)
=== RUN   TestAccDatabaseSecretBackendConnection_mysql_tls
    resource_database_secret_backend_connection_test.go:730: "MYSQL_CA" must be set
--- SKIP: TestAccDatabaseSecretBackendConnection_mysql_tls (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_postgresql
--- PASS: TestAccDatabaseSecretBackendConnection_postgresql (1.48s)
=== RUN   TestAccDatabaseSecretBackendConnection_postgresql_cloud
    resource_database_secret_backend_connection_test.go:847: "POSTGRES_CLOUD_URL" must be set
--- SKIP: TestAccDatabaseSecretBackendConnection_postgresql_cloud (0.00s)
ok  	github.com/hashicorp/terraform-provider-vault/vault	5.918s

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