8ca9ba946e
We have a fake ldap implementation for testing, but the tests still fail if ldap isn't installed. This modifies the usage of ldap in the LdapDNS tests to stub the module before attempting to import it. This allows us to test without having python-ldap installed. It removes the unneccessary FakeLdapDNS in favor of using the real LdapDNS with the module stubbed out. It also removes the dependency on python-ldap from test-requires. Change-Id: Ifbe09e16436afa6999dcb7385763492b0026556c