Revert "gfs2: fix a deadlock on withdraw-during-mount"

Revert "gfs2: fix a deadlock on withdraw-during-mount"

The current withdraw code duplicates the journal recovery code gfs2
already has for dealing with node failures, and it does so poorly.  That
code was added because when releasing a lockspace, we didn't have a way
to indicate that the lockspace needs recovery.  We now do have this
feature, so the current withdraw code can be removed almost entirely.
This is one of several steps towards that.

Reverts commit 865cc3e9cc0b ("gfs2: fix a deadlock on
withdraw-during-mount").

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>