Engine changes for API param to show soft-deleted stacks

blueprint stack-list-soft-deleted

Change-Id: Ie649d9a2b4132795e048325dedc46900c6f34eac
API changes for param to show soft-deleted stacks

blueprint stack-list-soft-deleted

Change-Id: I9b56ee877746c25c6acefb91fc3eae63701aedd6
Clean up openstack-common.conf

oslo-incubator will introduce new integrity check in [1].
That will help developer find inconsistent issue while copying
from oslo-incubator. The check just outputs warnings. These are
changes according to warning:
 * remove unused module py3kcompat
 * add missing module context, processutils in openstack-common.conf
 * sort the modules in openstack-common.conf
[1] https://review.openstack.org/#/c/76901/

Change-Id: I2fea01148f6ad268a5fcfdaa788e30d6fcb48c3f
Related-Bug: #1295582
Add glanceclient to heat

To enable implementation of a glance image resource, we first need to add
access to glanceclient in heat.

Change-Id: Ie0623e0307f6d3163ae584ceab89453f71f48053
Implements: blueprint glance-image
Make a top level contrib doc header

This is to just make it clear that there are other resources
besides Rackspace ones.

This is not really a bug as both the rackspace and docker
headings are the same level, but when going to the page it
is easy to see why the bug was made.

Change-Id: I76a8bcf63b7c976c4fcf0baecfd58e5fcbb65d96
Fixes-bug: #1311565
Merge "Engine changes for API param to show soft-deleted stacks"
Merge "API changes for param to show soft-deleted stacks"
Updated from global requirements

Change-Id: I805cbe40724a7669ed8e4f61f6afdd9528a43777
Merge "Make a top level contrib doc header"
Merge "Updated from global requirements"
Merge "Add glanceclient to heat"
Merge "Clean up openstack-common.conf"