Add libsnmp-dev
Add libsnmp-dev

Phosphor-snmp uses net-snmp,therefore it is required
to pull this library into the CI to verify builds.

Change-Id: Id619cfb3a6e9505eb31329eccaed53d0e07ae656
Signed-off-by: Ratan Gupta <a42a43504c26cfe5294e3d72712325cd74a43440@in.ibm.com>

openbmc/openbmc-build-scripts,openbmc/openbmc-build-scripts