staging/lustre/mgc: remove server specific llog handling

In mgc_process_cfg_log() remove code to handle
LLOG_CONFIG_ORIG_CTXT. This context is not setup on clients.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>