Listing Users should support domain_id in query filter

Listing Groups and Projects support domain_id in their query
filter, for some reason this was missing from Users.  I also
re-ordered the query filter options for Users and Projects to be
alphabetical, to match how we give entity examples.

Fixes bug #1118161

Change-Id: I2c99acb175b3f2184536d5f5b4a57702889eb8be
Merge "Listing Users should support domain_id in query filter"