rpaas: do not leave on consul agent terminate
rpaas: do not leave on consul agent terminate

Today, rpaas healing relies on consul for information about services. If
some node instance need to be reinstalled, IaaS will try to terminate
all processes before reinstall it. It may cause permanent node
failure if machine not return on first reinstall attempt since it will
be removed from consul services. Set skip_leave_on_interrupt will avoid
consul agent to send leave message to consul cluster on reinstall or
reboot events.

tsuru/puppet-tsuru,tsuru/puppet-tsuru,tsuru/puppet-tsuru