LU-8079 llog: Remove llog_cat_init_and_process

LU-8079 llog: Remove llog_cat_init_and_process

Unlike name suggests, this function does no longer process
the log but only initialize it. Replace it by direct calls
to the function it wraps.

Signed-off-by: Henri Doreau <henri.doreau@cea.fr>
Change-Id: Ib48e7d4cb15a2433cc07c6760e25450a9aa0a3b3
Reviewed-on: http://review.whamcloud.com/19850
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>