LU-6324 osd: allow larger osd_thread_info for debug

LU-6324 osd: allow larger osd_thread_info for debug

In osd_mod_init() skip the CLASSERT() on the size of struct
osd_thread_info if CONFIG_DEBUG_MUTEXES or CONFIG_DEBUG_SPINLOCK is
defined.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I1320403a345886cefaf538dbf80d7c49fa226183
Reviewed-on: http://review.whamcloud.com/13955
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>