Test suite

[akkornel]

Even though this is just a wrapper on top of python-ldap (or pyldap), it would be nice to have a proper test suite for all this stuff.

@akkornel has been writing a generic set of syncrepl tests for the python-ldap project. Maybe take those, along with python-ldap's test harness, and implement that here. NOTE: We'd have to check license compatibility if we take the test harness code. The syncrepl tests were written by @akkornel, so that's safe to take.