Channel::from_shared doesn't support unix URIs

[bouk]

Bug Report

If I do Channel::from_shared("unix:///tmp/test") I get a invalid URI unix:///tmp/test. Reason invalid format. This is because the URI is parsed by http::uri::Uri which doesn't support that protocol.

Endpoint::from_shared works fine though since this PR: #2218

I can switch to Endpoint::from_shared but this behavior is a bit unexpected.

Version

0.14.2