Pytest-redis

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Features
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- Added datadir configuration that allows to modify the placement of a redis_proc generated files in the specific place.
This helps overcome the issue with long tmp paths on macosx separately from the temporary path itself.

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Features
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- Configure redis to listen on specific hostname exclusively using `--bind` parameter.

Misc
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- rely on `get_port` functionality delivered by `port_for`

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Misc
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- Rise more informative error when the unixsocket is too long. Now the error
will hint at solution how to overcome it. This might be issue especially on
MacOS, where the default temp folder is already a long path

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Features
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- Rely on tmpdir_factory for handling tmpdirs. Now it's cleanup should
be handled better without much of the leftovers dangling indefinitely
in the tmp directory.
- Store pidfile in fixture's temporary directory
- Support only python 3.7 and up

Backward incompatibilities
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- Dropped `--redis-logsdir` command line option, `redis_logsdir` ini file
configuration option and `logsdir` fixture factory configuration option.
Logs will be automatically placed in fixture's temporary directory.
- Dropped `logs_prefix` argument from fixture factory argument

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- [feature] ability to properly connect to already existing postgresql server using ``redis_nooproc`` fixture.
- [enhancement] dropped support for python 2.7

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- [bugfix] - close file descriptor when reading redis version (by brunsgaard)