Openvswitch component implemented

* Openvswitch installer and uninstaller components added.
* Openvswitch component configuration added.
* RHEL distro updated with openvswitch commands.
* Components order corrected in personas files.
* Openvswitch configuring script removed.

Change-Id: I418f5b783da4db7c63c03c8bd3db21fbddbd8cd7
Update requirements

* Requirements and test requirements updated to match ones
from openstack/requirements.
* Clean-up pep8 errors that appeared after requirements
update.

Change-Id: Id9a01f83d0904d82a592492abad667f42e07389b
Merge "Openvswitch component implemented"