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Installation script: ``--pypi-mirror``, ``--package-mirror`` and ``--venv-mirror``
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Use case
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Installation is pretty easy when there is an Internet connection available.
And there is surely a number of OpenStack uses when whole environment is isolated.
In this case, we need somehow specify where installation script should take 
required libs and packages.


Problem description
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    #. Installation script can't work without direct Internet connection


Possible solution #1
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    #. Add ``--pypi-mirror`` option to installation script.
    #. Add ``--package-mirror`` option to installation script.
    #. Add ``--venv-mirror`` option to installation script.