MDEV-9020: Connect issues ALTER TABLE DISABLE KEYS when inserting data

If the connecting user doesn't have alter table privilege this isn't
allowed.

This patch removes enable / disable key commands that should never have been here

Closes #2002

storage/connect/tabmysql.cpp

@@ -946,15 +946,6 @@ bool TDBMYSQL::OpenDB(PGLOBAL g)
 
       } // endif MakeInsert
 
-    if (m_Rc != RC_FX) {
-      char cmd[64];
-      int  w;
-
-      sprintf(cmd, "ALTER TABLE `%s` DISABLE KEYS", TableName);
-      
-      m_Rc = Myc.ExecSQL(g, cmd, &w);   // may fail for some engines
-      } // endif m_Rc
-
   } else
 //  m_Rc = (Mode == MODE_DELETE) ? MakeDelete(g) : MakeUpdate(g);
     m_Rc = (MakeCommand(g)) ? RC_FX : RC_OK;
@@ -1216,16 +1207,6 @@ int TDBMYSQL::DeleteDB(PGLOBAL g, int irc)
 void TDBMYSQL::CloseDB(PGLOBAL g)
   {
   if (Myc.Connected()) {
-    if (Mode == MODE_INSERT) {
-      char cmd[64];
-      int  w;
-      PDBUSER dup = PlgGetUser(g);
-
-      dup->Step = "Enabling indexes";
-      sprintf(cmd, "ALTER TABLE `%s` ENABLE KEYS", TableName);
-      Myc.m_Rows = -1;      // To execute the query
-      m_Rc = Myc.ExecSQL(g, cmd, &w);  // May fail for some engines
-      } // endif m_Rc
 
     Myc.Close();
     } // endif Myc