Fix tallyho ansible deployment scripts due to role updates

[JohnMwashuma]

Task check list

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• [x] Update ona ansible django role to check if the uwgis array variable has been set and has items
• [x] Rename/Fix Django restart service handler on tallyho ansible role.
• [x] Update tallyho ansible group vars.

[JohnMwashuma]

Closed by the following prs:

• https://github.com/onaio/ansible-django/pull/47
• https://github.com/onaio/ansible-tally-ho/pull/15
• https://github.com/onaio/infrastructure/pull/7000