[table service] Fix python client can't read keys written by java clients

[sijie]

Descriptions of the changes in this PR:

Motivation

Python client is a thin table service client. So it relies on storage container
intercepting the requests to attach routing header. It attaches the routing header
if the requests are needed to route to remote containers; however for the local containers
it doesn't attach the right routing header.

Changes

Fix StorageContainerImpl to use proxy routing interceptor to intercept requests to attach routing header.

Tests

Add integration tests in python client & add test for python clients reading key/value pairs written by java clients.

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