LU-3778 sptlrpc: OSP and LWP don't know sptlrpc

LU-3778 sptlrpc: OSP and LWP don't know sptlrpc

The sptlrpc subsystem must be initialized for OSP and LWP
connections, by calling sptlrpc_lprocfs_cliobd_attach().
Moreover, GSS related functions must not return an LBUG when
dealing with OSP and LWP OBDs.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: I3d4bc635a7076addea7bbb52ac13f74a25f625ad
Reviewed-on: http://review.whamcloud.com/14040
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>