Add ability to specify attr name in set_search_seed
Combine get_ldap_user and get_all_ldap_users to ldap_users

Add ability to clean the directory from user accounts
Apply the previous helper changes to the test suite

Move some login tests to the non-ldap class
Remove try/except block, ldap connection check is performed already
Improvements in signup/activate views:

Use .latest() for getting the max uidNumber
Add all needed LDAP attributes
Other minor improvements
Add @anonymous_required decorator
Add tests for OkupyCipher
minor fix in .coveragerc
Major rewrite of the signup tests, lots of integration tests converted to unit
Remove the fixture
remove edpwd
Add tests/vars.py that stores variables used by the tests

Since we tend to re-use the same vars between test files, keeping them in a
central place seems reasonable