LU-3161 lod: Added proper error handling instead of LASSERT

LASSERT are replaced with proper error handling in
lod_initialize_objects.

Signed-off-by: Gaurav Mahajan <gmahajan@ddn.com>
Change-Id: Ia8fbbb4956765835bf46b46b3a7addc99cb191fa
LU-2842 mdt: Do not lbug on invalid fid entry in name

Instead of crashing MDS when the name exists but has invalid fid,
we should just return error and let lfsck deal with it later.

Change-Id: Iea19dac75e9dc75c43a18efa757fc1c5e4d1743e
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>