gfmd promotion should call inode_remove_orphan() and inode_check_and_repair()

[n-soda]

inode_remove_orphan() and inode_check_and_repair() are called only at startup of master gfmd.

Therefore, if the gfmd is running non-stop
(in such operation, a master gfmd is only created by promotion from slave to master, and never created as a master from the startup time),
these functions are never called, and the memory of gfmd and the storage of the backend database are wasted as a result.

To fix this problem, these functions should be called when slave gfmd is promoted to master, and if it's not in read-only mode.