Allow hgrc's proxy host and $http_proxy env var to start with http://

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Allow hgrc's proxy host and $http_proxy env var to start with http://

manifest hash: 5bf4bb43606f3e5544d55be886502ab5a61f9ff3
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mercurial/hg.py

@@ -1333,6 +1333,8 b' class remoterepository:'
         host = ui.config("http_proxy", "host")
         if host is None:
             host = os.environ.get("http_proxy")
+        if host and host.startswith('http://'):
+            host = host[7:]
         user = ui.config("http_proxy", "user")
         passwd = ui.config("http_proxy", "passwd")
         no = ui.config("http_proxy", "no")