Pytest-elasticsearch

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- [cleanup] Drop support for python versions older than 3.6
- [fix] Adjust for mirakuru 2.2.0 and up

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- [enhancement] Created a specified Executor to manage elasticsearch
- [enhancement] added new elasticsearch_nooproc fixture to connect to already
existing elasticsearch index
- [cleanup] Drop support for unused discovery_zen_ping_multicast
and elasticsearch_configuration_path option
- [cleanup] Drop support for elasticsearch older than 5
- [cleanup] Drop support for python versions older than 3.5
- [bugfix] changed default index.memory type to mmapfs, over long invalid
memory type

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- [feature] - Support for major elasticsearch versions

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- [cleanup] - removed path.py dependency

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- [feature] - migrate usage of getfuncargvalue to getfixturevalue. require at least pytest 3.0.0
- [feature] - default logsdir to $TMPDIR
- [feature] - run process on random port by default - enhances xdist experience

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- [feature] use tmpfile.gettempdir instead of hardcoded /tmp directory
- [docs] added description to all command line and ini options
- [bugfix] made command line option's dests more distinc, to prevent from influencing other pytest plugins