Add a E2E test for ws client sending binary payloads

[roycaihw]

Ref kubernetes-client/python-base#152. We should have a test case for ws client sending bytes data in our e2e tests.

cc @sergei-maertens

[roycaihw]

Currently we only have text test cases.

A binary payload test case can be copy a file to a pod and read it back. The request sent by this client will be similar to what kubectl cp sends. One can specify the verbose level (e.g. kubectl cp -v=9) to see details about the request. The basic commands are defined here. For the e2e test, also note that the container should have tar installed if we do the same as kubectl cp.

Once we have the test, it would be great if we can also show the test fails if we exclude the fix kubernetes-client/python-base#152.

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