mds: fix --reset-journal
mds: fix --reset-journal

Don't fork.  (Already fixed in master branch by the start_with_nonce
refactor, so this is just for 0.27.1.)

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

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