staging/lustre/ptlrpc: remove LUSTRE_MSG_MAGIC_V1 support

Remove the remains of LUSTRE_MSG_MAGIC_V1 support from ptlrpc.
It has not been supported since 1.8 and is not functional since 2.0.

In lustre_msg_check_version(), return an error for unsupported RPC
versions so that the server will reject such RPCs early.  Otherwise
the server only prints an error message and continue on.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-on: http://review.whamcloud.com/14007
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6349


Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>