LU-17065 build: Remove snmp support

LU-17065 build: Remove snmp support

Last patched in 2012 and not well tended to before that,
snmp support can probably be removed.

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I1831aed42e560531e57a6ff8aa978f3e5286fd44
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52194
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>