Configure standalone pipelines for cfn and cloudwatch.

Configure standalone pipelines for cfn and cloudwatch.

This allows waitconditions and cloud watch data to authenticate
using just the ec2token middleware. Stacks have been successfully launched
with a standalone heat onto an external grizzly openstack, including working
waitconditions and watch data.

This means that currently when in standalone mode, heat-cfn cannot
authenticate since it defaults to auth strategy keystone (and it appears
that auth strategy ec2 signing has not been implemented yet). This case
is sufficiently obscure that it most likely won't affect anyone at this
stage.

Implements blueprint heat-standalone

Change-Id: I7d096b11e70c234d0b2322c93bf5f4d4e6b01b4f