Upgrade oslo.vmware>=0.8.0

This release includes several bug fixes (https://launchpad.net/oslo.vmware/+milestone/0.8.0)
as well as many other changes:

969bfba Switch to use requests/urllib3 and enable cacert validation
5b9408f Updated from global requirements
9d9bf2f Updated from global requirements
1ebbc4d Enable support for python 3.x
4dc0ded Updated from global requirements
589ba43 Activate pep8 check that _ is imported

Change-Id: I3912eb965359f1aa29b9313218924ceabd5d839e
Updating python-glanceclient to 0.15.0 release

Primarily, this addresses some forward compatibility
API changes happening in the Glance service. Without this
release, devstack deployments will have errors using the
v2 API due to patches added in Kilo.

In addition it contains patches that both Nova and Horizon
required.

Release notes: https://review.openstack.org/#/c/140079/
Other Release notes since the requirements were last
updated:
https://review.openstack.org/#/c/135267/

Change-Id: I5e3e1cd630505f735fa3c8a25a872769db48ff3b
Merge "Upgrade oslo.vmware>=0.8.0"