Support unix socket with urls/uri (#43560)

* First pass at allowing unix socket with urls/uri. See #42341

* Only insert handler as needed

* Fix and add tests

* Add HTTPS functionality for unix sockets

* Additional test fixes

* Create context manager for monkey patching HTTPConnection.connect, de-dupe code, raise better errors

* doc

* Add a few more tests

* Fix __call__

* Remove unused import

* Patch HTTPConnection.connect with the functionality we want, instead of duplicating code and disabling

* Fix var name

* Remove unused var

* Add changelog fragment

* Update uri docs

* Fix rebase indentation issue

test/units/module_utils/urls/test_urls.py

@@ -89,3 +89,11 @@ def test_ParseResultDottedDict():
     assert parts[0] == dotted_parts.scheme
 
     assert dotted_parts.as_list() == list(parts)
+
+
+def test_unix_socket_patch_httpconnection_connect(mocker):
+    unix_conn = mocker.patch.object(urls.UnixHTTPConnection, 'connect')
+    conn = urls.httplib.HTTPConnection('ansible.com')
+    with urls.unix_socket_patch_httpconnection_connect():
+        conn.connect()
+    assert unix_conn.call_count == 1