Merge lp://qastaging/~harlowja/cloud-init/url-ssl-fixings into lp://qastaging/~cloud-init-dev/cloud-init/trunk

So I looked into the requests code, they are using in a underlying layer the HTTP[d]Connection objects and the regular ssl object, this should allow it to use the system certificates as a fallback. So thats good news!

I'm sorry this is such a pain.
$ python -c 'from cloudinit import util; util.read_file_or_url("http://brickies.net")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "cloudinit/util.py", line 689, in read_file_or_url
    ssl_details=ssl_details)
  File "cloudinit/url_helper.py", line 163, in readurl
    r = requests.request(**req_args)
  File "/usr/lib/python2.7/dist-packages/requests/api.py", line 44, in request
    return session.request(method=method, url=url, **kwargs)
TypeError: request() got an unexpected keyword argument 'config'

$ dpkg-query --show python-requests
python-requests 1.1.0-1

See https://launchpad.net/ubuntu/+source/requests for all the ubuntu versions:
 precise: 0.8.2-1
 quantal: 0.12.1-1ubuntu6
 raring: 1.1.0-1
 latest-release: 1.1.0

Your committed code does work on precise and quantal.

Also:
$ python -c 'from cloudinit import util; import sys; print util.read_file_or_url(sys.argv[1])' https://stackoverflow.com/
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "cloudinit/util.py", line 701, in read_file_or_url
    ssl_details=ssl_details)
  File "cloudinit/url_helper.py", line 173, in readurl
    if isinstance(e, (exceptions.HTTPError)) and e.response:
AttributeError: 'HTTPError' object has no attribute 'response'

$ dpkg-query --show python-requests
python-requests 0.8.2-1

Ok dokie, think those are all fixed by more checks on the requests version and the http error exception object.