Create redstack command for post devstack run

Created a new command called post-devstack, which is meant to be run after a reddwarf devstack install.
The new redstack task does the following:
1. Create extra test users needed for the integration tests (eg. daffy, chunk, etc.)
2. Modify the integration test config files.
3. Install the needed test packages (proboscis/nose)
4. Build the guestimage and upload it to glance

Also fixed the path of the reddwarf conf files to be /etc/reddwarf and not ~.
(To be consistent with other OS components)

Fixes bug 1101297, 1101296

Change-Id: I352d0e50c4af5c7a131eae2b2a21b55cd1d52e7b
Merge "Create redstack command for post devstack run"