Add XenAPI to OpenStack dependencies

This way, the XenAPI package will be mirrored by the OpenStack pypi
mirror, so it could be installed in the gate.

Change-Id: I185f9ccf26c59a339f94f6918d695f28a5eb5b62
Unpin kazoo

There doesn't seem to be a reason to pin to a
year old version of kazoo since other projects
would like to use the newer version its safer
just to unpin the version restriction.

Change-Id: I7c5a74e06f604ce89f0de0a4b01a8f7be41d70a2
Update python-keystoneclient to 0.5.0

A new version of keystoneclient was released containing changes we
wish to use in Heat, so bump to the latest version.

Change-Id: I62fe2363e97df9a8825c91ba67a1d86c927eaf22
Merge "Unpin kazoo"
Merge "Add XenAPI to OpenStack dependencies"
Merge "Update python-keystoneclient to 0.5.0"
Start renaming oslo.sphinx to oslosphinx

Add oslosphinx in addition to oslo.sphinx so we can update
consuming projects before removing oslo.sphinx from the
dependency list.

Partial-bug: #1277168

Change-id: I7788a9d6b5984fdfcc4678f2182104d2eb8a2be0