mon/MonClient: before complete auth with error, reopen session

mon/MonClient: before complete auth with error, reopen session
When monClient try to authenticate and fail with -EAGAIN there is
a possibility that we no longer hunting and not have active_con.
that will result of disconnecting the monClient and ticks will continue
without having open session.
the solution is to check at the end of auth, that we don't have -EAGAIN
error, and if we do, reopen the session and on the next tick try auth again

Fixes: https://tracker.ceph.com/issues/58379
Signed-off-by: Nitzan Mordechai <nmordech@redhat.com>