LU-6349 ptlrpc: remove LUSTRE_MSG_MAGIC_V1 support

LU-6349 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.

Fix up whitespace and code style in lustre_msg_*() accessor functions.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I001def16e242d6ab64122912ac69fb0a072c312f
Reviewed-on: http://review.whamcloud.com/14007
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
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>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>