Test coverage improvement for FWaaS screens

This patch set adds 'delete' ans 'update_get' tests
for policies, rules and firewalls and removes some
redundant code from another tests.

Closes-Bug: #1274136

Change-Id: I5e00419621fd6aa14ec82a5a19887754e03c1d0e
Clear date picker fields every time 'Other' Period is selected

In subsequent selections of 'Other' from Period field in Admin > Resources
Usage Overview panel previously picked dates for From and To fields remain.
This patch is to clear those fields every time 'Other' is selected, as
preserving the values could be confusing.

Change-Id: If82aa26cd453a038fb8821a4c33f979dd4dbb8a9
Closes-Bug: #1280441
typos in workflows/views.py

  Fixed a few typos in workflows/views.py

  Closes-Bug: #1281276

Change-Id: Ib2560be467cb05e175545772eaa3ca0d6666e52c
Merge "Test coverage improvement for FWaaS screens"
Merge "typos in workflows/views.py"
Merge "Clear date picker fields every time 'Other' Period is selected"