LU-2675 osc: remove obsolete llog handling

LU-2675 osc: remove obsolete llog handling

In osc_disconnect() LLOG_SIZE_REPL_CTXT was never setup so remove the
code to sync and put the content. In osc_precleanup() remove the no-op
call to obd_llog_finish().

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I41ce7effbd017862aa216d4a09c15694ec11d597
Reviewed-on: http://review.whamcloud.com/11774
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>