LU-974 protocol: change OBD_CONNECT_GRANT_PARAM

LU-974 protocol: change OBD_CONNECT_GRANT_PARAM

Change the OBD_CONNECT_GRANT_PARAM flag value to avoid conflict
with the OBD_CONNECT_UMASK flag from LU-974.  While that patch is
not yet landed to our release tree, it is in use in production at
some customers.  While the risk of conflict is currently low, it
is easier to change the GRANT_PARAM value since only in use on the
orion branch, and isn't even handled by the client there yet.

Add (hopefully) clear comments for OBD_CONNECT and obd_connect_data
to ensure that they are not modified in some incompatible way across
branches.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I503892c3b595c0272b0941fa58a16a49631ecab0
Reviewed-on: http://review.whamcloud.com/2297
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>