Merge multiple functions for creating consul containers into one. (#6612)

Merge both functions for creating mongodb containers into one.
Add retries to docker container cleanups.
Require $VAULT_ACC be set to enable AWS tests.

plugins/database/mysql/mysql_test.go

@@ -9,9 +9,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/hashicorp/vault/sdk/database/helper/credsutil"
-
+	"github.com/hashicorp/vault/helper/testhelpers/docker"
 	"github.com/hashicorp/vault/sdk/database/dbplugin"
+	"github.com/hashicorp/vault/sdk/database/helper/credsutil"
 	"github.com/ory/dockertest"
 )
 
@@ -36,10 +36,7 @@ func prepareMySQLTestContainer(t *testing.T, legacy bool) (cleanup func(), retUR
 	}
 
 	cleanup = func() {
-		err := pool.Purge(resource)
-		if err != nil {
-			t.Fatalf("Failed to cleanup local container: %s", err)
-		}
+		docker.CleanupResource(t, pool, resource)
 	}
 
 	retURL = fmt.Sprintf("root:secret@(localhost:%s)/mysql?parseTime=true", resource.GetPort("3306/tcp"))