fixed MHA online switch master,when orig_master and new_master is same.

[liucyao]

when you switch master online,masterha_master_switch --master_state=alive --conf=/etc/masterha/app1.conf --new_master_host=xxxx --new_master_port=xxx, you new_master_host and new_master_port is same as you orig_master_host orig_master_port,MHA will execute function reject_update,it cause master failover vip change and set read_only on it until master_pos_wait exit.

[sjas]

Trying to write the bug description in proper english as far as i can understand:

when you switch the master online:

masterha_master_switch --master_state=alive --conf=/etc/masterha/app1.conf --new_master_host=xxxx --new_master_port=xxx

with your new_master_host and new_master_port being the same as you orig_master_host and orig_master_port

MHA will execute function reject_update, causing master failover vip change and set it to read_only until master_pos_wait exits.