LU-5814 lov: remove unused {get,set}_info handlers

In LOV and OSC remove handlers for the obsolete get and set info keys:
KEY_CAPA_KEY, KEY_CONNECT_FLAG, KEY_EVICT_BY_NID, KEY_LAST_ID,
KEY_LOCK_TO_STRIPE, KEY_MDS_CONN, KEY_NEXT_ID.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Iab1adaffc4ea860ea6ce2a2614b5ab6f6444e34b
Reviewed-on: http://review.whamcloud.com/12445
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>