binary websocket support, plus examples

[aogier]

Hello, in #476 we noted that we currently cannot stream binary data to/from pods so no feature like kubectl cp (and probably others) could be implemented.

I've worked on that, two PR came out. The first is kubernetes-client/python-base#52 and when it will be merged, this one will then unlock binary streams and provide couple examples on how to do it.

Problem: I had to patch core_v1_api.py swagger generated code, as swagger itself seems to ignore binary type specification. I'm currently investigating on that.
In the meanwhile I could produce a temporary patch in scripts/ and apply it when client-updateing but I'd like to know what do you think about that part.

Thank you, ciao

[aogier]

I think I've successfully patched swagger in swagger-api/swagger-codegen@676da33 although my tests aren't supported by a successful CI run because starting branch obsolescence.

Basically I'm using six.binary_type that translate to str on py2 (no-op), and bytes on py3 and this need to be checked throughly against py3 tests in python-base (afaict python-client tests are empty, and for sure they return OK).

I'll work on testing against our needs but seems promising !

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