Watcher should use openstack global requirements

[Taylor Peoples]

Watcher should be adhering to the global requirements agreement outlined at https://github.com/openstack/requirements#global-requirements-for-openstack-projects

Things needed:

1) Ensure the current requirements match up with openstack/requirements and if not, fix them
2) A change needs to be proposed to openstack/requirements to include openstack/watcher
3) A change needs to be proposed to openstack-infra/project-config to include openstack/watcher

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/269310

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/269310
Committed: https://git.openstack.org/cgit/openstack/watcher/commit/?id=0ba8a35ade3832c446e262acd197c45b9631d8f5
Submitter: Jenkins
Branch: master

commit 0ba8a35ade3832c446e262acd197c45b9631d8f5
Author: Taylor Peoples <email address hidden>
Date: Mon Jan 18 23:21:01 2016 +0100

    Sync with openstack/requirements master branch

    In order to accept the requirements contract defined in
    openstack/requirements, we need to sync with the master branch of that
    project's global-requirements.txt and test-requirements.txt files.

    Most of the changes are just version changes and nothing major. The
    only major change is:

    1) The twine dependency is removed, and therefore the pypi tox
    environment was also removed.

    Change-Id: Idbe9e73ddc5a34ac49aa6f6eff0779d46a75f583
    Closes-Bug: #1533282