FileStore.h: reorder queue operations in _journaled_ahead
FileStore.h: reorder queue operations in _journaled_ahead

In writeahead mode, an op could dissappear from jq without immediately
reappearing in q.  Thus, q can be empty before seq is requeued and
finished.  _journaled_ahead will now enqueue the op in q before removing
from jq.

Signed-off-by: Samuel Just <4c46b94684b338bae1ed5e7e1321718dd75401cc@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph