Temporary fix agent-compute dpkg bug 1221945

See https://bugs.launchpad.net/cloud-archive/+bug/1221945
The ubuntu cloud archive ceilometer-agent-compute pkg has a bug in which init
script isn't installing properly gets installed as:
/etc/init/ceilometer-agent.conf.dpk-new therefore until it gets fixed this temp
solution works

Change-Id: I0f017c834e23fb731e5ca57fb9ab90826072c1cd