LU-12923 pltrpc: Use BUILD_BUG_ON() for wiretest.c

LU-12923 pltrpc: Use BUILD_BUG_ON() for wiretest.c

This patch replaces all CLASSERT() with kernel defined
BUILD_BUG_ON() for file lustre/ptlrpc/wiretest.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: Iaf0a9074809883f6eac2274a9e9bfba26a0ac84e
Reviewed-on: https://review.whamcloud.com/36648
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Oleg Drokin <green@whamcloud.com>