Allow http tests to run in parallel by using ephemeral ports

Make http stream wrapper advertise HTTP/1.1 by default

In practice, we always act as an HTTP/1.1 client, for compatibility
with servers which ignore protocol version. Sending the version

Make http stream wrapper advertise HTTP/1.1 by default

In practice, we always act as an HTTP/1.1 client, for compatibility
with servers which ignore protocol version. Sending the version in
the request will avoid problems with servers which don't ignore it.

HTTP/1.0 can still be forced using a stream context option.

Closes GH-5899.

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Fixes #79265: Improper injection of Host header when using fopen for http requests

Check all occurrences of the string "host:" (and other headers),
not just the first one.