Add a basic heat-manage

The heat/cmd/manage.py structure is copied from glance to give
us some consistency.

Removing unused cliutils ...

blueprint heat-manage
Change-Id: If3b69eb4c3672740515fd308ec868af1cd3c9396
Fail validation when security groups and interfaces conflict

The 'SecurityGroups' property of the instance is not taken into account
by Nova when the 'NetworkInterfaces' property is also defined. Instead the
security groups should be applied to the network interface resource(s).

This issue has already raised a couple of invalid bugs on Launchpad.

Change-Id: I5ae2ba356518d391893c2a479c5952b13b6e8d55
Merge "Fail validation when security groups and interfaces conflict"
Merge "Add a basic heat-manage"