Added FreeBSD support

Signed-off-by: Michael Arnold <github@razorsedge.org>
Fixed service config path

Signed-off-by: Michael Arnold <github@razorsedge.org>
Added variable for group ownership for snmpd.conf/snmptrapd.conf

Signed-off-by: Michael Arnold <github@razorsedge.org>
Added spec test for FreeBSD

Signed-off-by: Michael Arnold <github@razorsedge.org>
Updated README.md

Signed-off-by: Michael Arnold <github@razorsedge.org>
snmp client test for FreeBSD

Signed-off-by: Michael Arnold <github@razorsedge.org>
Merge branch 'wahsatterwhite-add_freebsd_support' into develop