Add django-bootstrap-form to requirements

This is required by bootstrap 3 update patch in openstack/horizon
https://blueprints.launchpad.net/horizon/+spec/bootstrap-update

Change-Id: I9749607ed808688af2ba3b021738420385062667
Add designate dns client (python-designateclient) to requirements

This is needed to support the addition of designate dns to trove

Change-Id: I1d4b97dc28dcca6151572228d5f70c678cbc42c4
Blueprint: designate-dnsaas-support
Merge "Add django-bootstrap-form to requirements"