Branch b1_4_mountconf

Branch b1_4_mountconf
b=4482
Fix some recovery problems with late-added OSTs. A "late-added" OST is one
which is added to the FS after the MDT is added.  Since the config logs are
not re-written, these OSTs get added to the LOV after the MDT starts up,
every time the MDT starts up.  We have to fix the mdsize, and re-setup the
llogs whenever we add a late OST.

This fix in particular: during replay on an MDT, we still have to set the
right mdsize, but don't re-setup the llogs until recovery finishes.
(replay-single test 13)
Also check recovery w/o replay: create file, failover MDT, create another file.