Update the api for serving plugins and provide a utility to pass TLS data for commuinicating with the vault process

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

@@ -4,11 +4,16 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/hashicorp/vault/helper/pluginutil"
 	"github.com/hashicorp/vault/plugins/database/postgresql"
 )
 
 func main() {
-	err := postgresql.Run()
+	apiClientMeta := &pluginutil.APIClientMeta{}
+	flags := apiClientMeta.FlagSet()
+	flags.Parse(os.Args)
+
+	err := postgresql.Run(apiClientMeta.GetTLSConfig())
 	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)

plugins/database/postgresql/postgresql.go

@@ -6,8 +6,10 @@ import (
 	"strings"
 	"time"
 
+	"github.com/hashicorp/vault/api"
 	"github.com/hashicorp/vault/builtin/logical/database/dbplugin"
 	"github.com/hashicorp/vault/helper/strutil"
+	"github.com/hashicorp/vault/plugins"
 	"github.com/hashicorp/vault/plugins/helper/database/connutil"
 	"github.com/hashicorp/vault/plugins/helper/database/credsutil"
 	"github.com/hashicorp/vault/plugins/helper/database/dbutil"
@@ -35,13 +37,13 @@ func New() (interface{}, error) {
 }
 
 // Run instantiates a PostgreSQL object, and runs the RPC server for the plugin
-func Run() error {
+func Run(apiTLSConfig *api.TLSConfig) error {
 	dbType, err := New()
 	if err != nil {
 		return err
 	}
 
-	dbplugin.Serve(dbType.(*PostgreSQL))
+	plugins.Serve(dbType.(*PostgreSQL), apiTLSConfig)
 
 	return nil
 }