HTTP persistent connection don't reconnect to bitcoind if server dies/re...

[legkodymov]

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If bitcoind dies/restarts - library fails to reconnect. I understand that it breaks advantage of persistent connection. But in my case this is the only way to go (in eloipool). I can rewrite this patch to look more clear if needed.

[luke-jr]

This breaks connection reuse, and has a messy print() in it.

[laanwj]

This is how we solved it for the bitcoin tests: https://github.com/bitcoin/bitcoin/blob/master/qa/rpc-tests/test_framework/authproxy.py#L122

Needs to be handled for Python <3.5 and >=3.5 differently. See:

• https://github.com/bitcoin/bitcoin/pull/8139
• https://github.com/bitcoin/bitcoin/commit/ddf98d1d84343f2db0502a85628ef80f2ec57dbd