ZhiQiang Fan 07238ac548 Fix typos and code style check
In neutron/api/extensions.py, there are some typos, no needed blank
lines and docstrings can be improved (according to HACKING.rst).

Closes-Bug: #1213541

Change-Id: I01087d133e1b2a7e69f0bcc2ae359a3a2042b1dc
2013-08-19 22:54:51 +08:00
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