Add filters to the collections 'self' link

The v3 collections wrapper automatically adds the collections links
(self, next, prev) to facilitate pagination. However, the 'self' url
link only contains the base url, without any specified filters.

This fix adds specified filters to the collections 'self' link.

To test this fix validations of list responses in test_v3_identity.py
were updated with the optional 'resource_url' parameter which triggers
the 'self' link validation.

Closes-Bug: #1195037.

Change-Id: Iff1bcf21ea4f716ea0f412b86b4c8e9126007b7b
Merge "Add filters to the collections 'self' link"