[#1117] Remove a legacy test for ignore_missing

ignore_missing() unit tests in ckan/new_tests/ have replaced this now.
[#1117] Add a new test for updating multiple user attributes at once
[#1117] Add another condition to a user_update test
[#1117] Add a test for user_update's annoying email behavior
[#1117] Add tests that user_update doesn't return password, apikey, etc.
[#1117] Fix silly test class name
[#1117] Remove legacy user_update tests

These have been replaced by new-style tests in ckan/new_tests/