ctdb-daemon: Reset push_started flag once DB_PUSH_CONFIRM is done

ctdb-daemon: Reset push_started flag once DB_PUSH_CONFIRM is done

Once DB_PUSH_START is processed as part of recovery, push_started
flag tracks if there are multiple attempts to send DB_PUSH_START.
In DB_PUSH_CONFIRM, once the record count is confirmed, all information
related to DB_PUSH should be reset.  However, The push_started flag was
not reset when the push_state was reset.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Wed Jun  8 14:31:52 CEST 2016 on sn-devel-144