More fixing for recovery-small/b=1300:

More fixing for recovery-small/b=1300:

 - fix type of o_destroy_export

 - getattr reconstruction can't rely on the mcd or exp_outstanding_reply,
   because getattrs no longer have transnos.  Happily, they don't need to.

 - reconstruct_open doesn't need to worry about the lock enqueued on the
   client's behalf, because we already fix all that up in
   fixup_handle_for_resent_req -- and it really doesn't need to LBUG.

Fix for MCR's MDS-side recovery LBUG today: pack a reply to send when aborting
queued recovery requests at timer-expiry.

When we fail an LASSERT, call the LBUG upcall with the location of the
assertion, not the constant-and-useless location of kportal_assertion_failed.