fix DinD host detection when using local socket

[ikravets]

When using IPC socket (unix/npipe) to communicate with local docker server docker-py implementation rewrites the base url to HTTP, see https://github.com/docker/docker-py/blob/e901eac7a8c5f29c7720eafb9f58c8356cca2324/docker/api/client.py#L143-L168

We cannot rely on URL scheme in order to detect such connections. Instead, we detect connection adapters added by docker-py api client:

• UnixHTTPAdapter https://github.com/docker/docker-py/blob/e901eac7a8c5f29c7720eafb9f58c8356cca2324/docker/transport/unixconn.py

• NpipeHTTPAdapter https://github.com/docker/docker-py/blob/e901eac7a8c5f29c7720eafb9f58c8356cca2324/docker/transport/npipeconn.py

As NpipeHTTPAdapter type may not be available outside of Windows we rely on adapter-specific attributes.

[codecov-commenter]

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[ikravets]

Rebased to the master. @tillahoffmann, any chance for a review?

[ikravets]

rebased to master

[tillahoffmann]

Thank you for these improvements! Are there tests that we could add that fail before the change is introduced to avoid future regressions?

[ikravets]

@tillahoffmann Hi, it's been more than half a year since I've opened this PR. Can we maybe merge this?

[ikravets]

@tillahoffmann a kind ping