Removes sanity tag from SNMP exporters test, preventing it from failing in our...

Removes sanity tag from SNMP exporters test, preventing it from failing in our pipeline until we have the right infra to run it

Change-Id: I6f93b08af57223f0f04621bbe22d406a64cac0d4
Signed-off-by: garciaale <agarcia@whitestack.com>