- Use the actual upstream distributed archive

- update to version 2.5.2
# 2.5.2 - 2018.12.28
    - when starting tls before binding the connection is automatically open
    - fixed changelog date (thanks Adam)
    - support for AD timedeltas (thanks mprahl)
    - fixed WhoAmI in mock strategies (thanks mprahl)
    - prevent unnecessary exception in extend/standard/ModifyPassword (thanks Johnny)
    - added support for external gssapi credentials to be passed to the sasl connection (thanks Firstyear)
    - added support for gssapi store in sasl connection (thanks clhendrick)
    - fixed LdifProducer (thanks antoinell)
    - fixed NTLM bind (thanks ribx)
    - server state in ServerPool is now a namedtuple "ServerState" (thanks Krisztian)
    - fixed error when adding member to AD group with unsafe DN (thanks Maxim)
    - properly restore lazy status in reusable strategy (thanks Krisztian)
    - ServerState namedtuple converted to class in core/pooling (thanks Krisztian)
    - empty schema doesn't raise exception in Abstraction Layer (thanks ghost)
# 2.5.1 - 2018.08.01
    - connection.result is populated when exception raised with raise_exceptions=True
    - fixed objectSid in mocking strategies
    - fixed circular reference in exception history
    - added objectSid validator
    - byte values are properly searched in MOCK strategies (thanks dyj216)
    - exception history refactored (thanks Tamas)
    - connections in context manager don't bind anymore when auto_bind is set to AUTO_BIND_NONE (Thanks Tim)
    - Cython compatible build (thanks Pedro)
    - more detailed exception message in Mock strategy (thanks Janne)
    - exceptions flow refactored in reusable strategy (thanks kxt)
    - pwdlastset accept any positive integer (thanks abenbecker)

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