Remove search tests

Removing search tests that fall into two categories:
* Tests that already have coverage provided by <a href="https://github.com/mozilla/mozillians/blob/master/apps/phonebook/tests/test_search.py">webdev's tests</a>.
* Tests that don't correctly provide coverage and provide a false sense of security - these need to be reworked to follow the proper workflow. I will file the appropriate git issues in webdev's & webqa's repos.