DBPW - Enables AutoMTLS for DB plugins (#10220)

This also temporarily disables couchbase, elasticsearch, and
mongodbatlas because the `Serve` function needs to change signatures
and those plugins are vendored in from external repos, causing problems
when building.

plugins/database/postgresql/postgresql-database-plugin/main.go

@@ -4,18 +4,26 @@ import (
 	"log"
 	"os"
 
-	"github.com/hashicorp/vault/api"
 	"github.com/hashicorp/vault/plugins/database/postgresql"
+	dbplugin "github.com/hashicorp/vault/sdk/database/dbplugin/v5"
 )
 
 func main() {
-	apiClientMeta := &api.PluginAPIClientMeta{}
-	flags := apiClientMeta.FlagSet()
-	flags.Parse(os.Args[1:])
-
-	err := postgresql.Run(apiClientMeta.GetTLSConfig())
+	err := Run()
 	if err != nil {
 		log.Println(err)
 		os.Exit(1)
 	}
 }
+
+// Run instantiates a PostgreSQL object, and runs the RPC server for the plugin
+func Run() error {
+	dbType, err := postgresql.New()
+	if err != nil {
+		return err
+	}
+
+	dbplugin.Serve(dbType.(dbplugin.Database))
+
+	return nil
+}