hgweb: fix broken URLs of RSS/Atom feeds (
issue1772)
This fixes doubled URL, e.g. http://example.orghttp://example.org/...,
which appears on RSS/Atom feeds served by hgwebdir.
It splits baseurl to update SERVER_NAME, SERVER_PORT and SCRIPT_NAME,
according to RFC 3875.
Updated the test output since SCRIPT_NAME becomes not to contain
http://host:port part.
foo renamed from bar:26d3ca0dfd18e44d796b564e38dd173c9668d3a9
rev offset length base linkrev nodeid p1 p2
0 0 6 0 0 26d3ca0dfd18 000000000000 000000000000
1 6 7 1 1 d267bddd54f7 26d3ca0dfd18 000000000000