[repository] move cnxset pool handling to a helper class The class has responsability to handle connections pool operations in a single public attribute 'cnxsets'. On Repository _get_cnxset() and _free_cnxset() are replaced by cnxsets.get() and cnxsets.release(). Drop multiple access to private attributes and methods from outside of Repository.

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[tox]

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envlist = py27,py34,flake8

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[testenv]

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sitepackages = true

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deps =

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  pytest

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commands =

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  {envpython} -m pytest {posargs:test}

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[testenv:flake8]

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skip_install = true

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whitelist_externals =

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  flake8

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deps =

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  flake8

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commands = flake8

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[flake8]

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exclude = cubicweb_%(cubename)s/migration/*,test/data/*,.tox/*