LU-2360 ptlrpc: don't clobber rq_history_seq with CPT_ANY

LU-2360 ptlrpc: don't clobber rq_history_seq with CPT_ANY

In ptlrpc_req_add_history() don't allow service_parts with cpt CPT_ANY
(-1) to clobber the timestamp and sequence bits of rq_history_seq.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I52161d6f36dcd70dd569b0be294e6d23cc5ac4a9
Reviewed-on: http://review.whamcloud.com/5207
Tested-by: Hudson
Reviewed-by: Liang Zhen <liang.zhen@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>