Add command_prompt, ssh-options to fence_apc

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Del custom fence_apc, fence_pdu_snmp, use fence_apc_snmp

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

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