LU-14291 lustre: only include nrs headers when needed

LU-14291 lustre: only include nrs headers when needed

Various lustre_nrs_*.h header are only needed on the server.  Make
this explicit, so it is easier to see which files are needed on the
client.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I9bc30acc4f62ea9af516055edbb7833919811089
Reviewed-on: https://review.whamcloud.com/41128
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>