Fix: support docker-py

[insuyun]

Hello,
This commit addresses issue #519. There are several things to discuss.

1. I copied and modified the code currently for urllib3. I thought this approach is cleaner than adding the code directly for urllib3, but if there's a better alternative, please let me know.

2. The tests are very limited. At the moment, they only ensure that Docker does not fall into an infinite loop.

3. As for Docker, there's actually no strong reason to replay it using vcrpy. Since the behavior can vary depending on the local environment, replaying it doesn’t seem particularly meaningful. For example, currently I’ve been ignoring cases from Docker using the ignore_localhost option. However, I’m unsure whether it would be better to enforce this approach for others.

Let me know your thoughts!

[luke-engle]

Out of curiosity, how are you bypassing this issue using ignore_localhost? When using vcrpy in conjunction with pytest-recording and setting @pytest.mark.vcr(ignore_localhost=True), I still get stuck in the infinite loop. FWIW, I'm with you in that for my particular use case, replaying docker isn't something that's useful.

Unless you mean you're using ignore_localhost alongside the changes in this PR 😄

[insuyun]

@luke-engle Hi! As you mentioned, I am using ignore_locahost alongside this change.