Initial versions from fence_agents v3.1.5-25

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Add Tripplite PDU support for fence_apc_snmp

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Backport sync from master upstream

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>