Updating server dependancies. (#9498)

vendor/github.com/go-sql-driver/mysql/driver.go

@@ -23,6 +23,11 @@ import (
 	"sync"
 )
 
+// watcher interface is used for context support (From Go 1.8)
+type watcher interface {
+	startWatcher()
+}
+
 // MySQLDriver is exported to make the driver directly accessible.
 // In general the driver is used via the database/sql package.
 type MySQLDriver struct{}
@@ -91,7 +96,9 @@ func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
 	}
 
 	// Call startWatcher for context support (From Go 1.8)
-	mc.startWatcher()
+	if s, ok := interface{}(mc).(watcher); ok {
+		s.startWatcher()
+	}
 
 	mc.buf = newBuffer(mc.netConn)
 
@@ -105,9 +112,6 @@ func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
 		mc.cleanup()
 		return nil, err
 	}
-	if plugin == "" {
-		plugin = defaultAuthPlugin
-	}
 
 	// Send Client Authentication Packet
 	authResp, addNUL, err := mc.auth(authData, plugin)