This patch prevents nailgun-agent from doing anything
until cloud-init has finished its magic.
/etc/nailgun-agent/nodiscover file is created during provisioning stage
and then it is removed in /etc/rc.local which guarantees
that nailgun-agent doesn't change mcollective config at the
same time when cloud-init does this. Otherwise, we can
end up with corrupted mcollective config.
Related-Patch: I5fca4ca39abdc273f6958f2643fae6c5c99fba68
Change-Id: If8d1252e6d351ad073de26afc13a19de76f531fb
Closes-Bug: #1449186
6b2ea2fbbb