Use mockldap for the tests

- Get rid of the forked django-auth-ldap, all the functionality is moved
to mockldap
- Get rid of ldapuser.py, it was used as a wrapper to ldap calls, in order
to determine whether we need as a wrapper to get either a python-ldap or
a mocked ldapobject. Mockldap handles this completely now, so the
ldapuser wrapper got useless.
- Use pure python-ldap calls instead of ldapuser ones in the view
- Adjust the tests to use mockldap instead of _LDAPConfig and MockLDAP
from django-auth-ldap
- Update the dependencies accordingly
Raise edpwd version, remove data_files (installed files in wrong places)
Merge pull request #15 from tampakrap/mockldap_v2

Mockldap v2