Code review comment for ~smoser/cloud-init:bug/silence-cheetah-userwarning

This is what i don't like:

$ tox-venv py27 nosetests tests/unittests/
...................SSSSS............................................................................................................................................................................................................................................................................................................................................................../home/smoser-public/src/cloud-init/cloud-init/.tox/py27/local/lib/python2.7/site-packages/Cheetah/Compiler.py:1509: UserWarning:
You don't have the C version of NameMapper installed! I'm disabling Cheetah's useStackFrames option as it is painfully slow with the Python version of NameMapper. You should get a copy of Cheetah with the compiled C version of NameMapper.
  "\nYou don't have the C version of NameMapper installed! "
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Ran 748 tests in 3.240s

OK (SKIP=5)