Devpi-ldap

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- Use ``escape_filter_chars`` before calling LDAP ``search`` method.
[mr-scrawley (Micha Schmierer), fschulze]

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- Fix issue 50: new server_pool setting.

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- Add ``timeout`` option for LDAP connections. Defaults to 10 seconds.

- Use ``safe_load`` to read YAML config.

- The ``reject_as_unknown`` option is now true by default.

- Drop support for Python < 3.6, support for Python 3.x will end with their
respective EOLs.

- Fix deprecation warning with devpi-server 6.0.0.

- Fix pluggy deprecation warning.

- Require at least devpi-server 5.0.0.

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- More ldap3 2.x fixes.
[fschulze]

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- Fix compatibility with ldap3 2.x.
[fschulze, abrasive (James Laird-Wah)]

- Stopped testing with Python 2.6, but no changes made which break compatibility.

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- Add support for TLS parameters in the config.
[jaraco (Jason R. Coombs)]

- Allow invocation via ``python -m devpi-ldap`` and fix cli for Python 3.
[jaraco]

- Add exit codes to testing script when authentication fails.
[jaraco]