Openvpn-status

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- Fix GH-11: Fix the parser which throws ``ValueError`` on interrupted stream.

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- Feature GH-1: Add support to TAP mode of OpenVPN servers by parsing virtual
addresses as MAC and IP both.
- Feature GH-4: Add support to client-config-dir (ccd) and iroute.
- Fix GH-2: **BREAK-COMPATIBILITY** Use real or virtual addresses as the key
of client_list and routing_table, instead of using common name.

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- Fix GH-3: The depended six must later than 1.9.0 because we need the
"python_2_unicode_compatible" decorator.

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The first release.