Make tests compatible with urllib3 >= 1.26.14

urllib3 now calls sock.settimeout:
https://github.com/urllib3/urllib3/pull/2869/files#diff-542c95910a277028550d2c8943e8c49bbcb10f9af96e35d0a0eee99b8cfe9e8cR235
which was not a property on our FakeSocket object used for testing.

Author: stealthycoin

tests/unit/botocore/test_awsrequest.py

@@ -53,6 +53,9 @@ def makefile(self, mode, bufsize=None):
     def close(self):
         pass
 
+    def settimeout(self, *args):
+        pass
+
 
 class BytesIOWithLen(six.BytesIO):
     def __len__(self):