Add package for fencing-agent script

Based on existing nailgun agent package and
its installation scheme

Required by: https://review.openstack.org/66608
Dependes on internal: OSCI-1003
Implements blueprint: fencing-in-nailgun-agent

Change-Id: I6c531ae91790c8385d89594681ee5d20c9671fe4
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Add package for fencing-agent script"