ubik: Replay the transaction log label correctly

ubik: Replay the transaction log label correctly

Commit eec0d94f519b3e27f255b9b7a637df043951424e fixed the transaction
replay log code to correctly identify valid transaction logs on
little-endian systems, but missed ntohl'ing the database label read in
a LOGEND opcode. Fix that, so the database is labelled correctly when
replayed from a transaction log.

And while we're here, actually pass a struct ubik_version* to
adbase->setlabel, to make it a little more clear what's happening.

Change-Id: I7edc33a4539f3b2fa342335c08f958b5dfb97f57
Reviewed-on: http://gerrit.openafs.org/3384
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>