LU-692 ptlrpc: don't LASSERT on larger ptlrpc_body

LU-692 ptlrpc: don't LASSERT on larger ptlrpc_body

Don't LASSERT() on a larger ptlrpc_body that might be sent from
the server.  The lustre_msg_size() function is called against
a lustre_msg buffer sent from the server in case of an early
reply, and it shouldn't LASSERT() on data received from the network.

Reserve OBD_CONNECT_* flags and obd_connect_data fields from master.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I1f68c20d1048c379ae33e328995673d3cfbe8145
Reviewed-on: http://review.whamcloud.com/1584
Tested-by: Hudson
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>