Update to the latest code from Oslo

Update apiclient code for python3.3 support

Сhanges from oslo-incubator related to apiclient:

Change 41dc2b4:  Encode response from FakeHTTPClient
Change e6494c2:  Use six.iteritems to make dict work on Python2/3
Change 0d8f18b:  Use urlutils functions instead of urllib/urllib2
Change 16fb43b:  Replace data structures' attribute with six module
Change fdb0f0f:  Common ConnectionRefused class
Change 9d0ec6a:  Use six.iteritems for python 3.3 support in apiclient module
Change 12bcdb7:  Remove vim header
Change 4c22556:  Use py3kcompat urlutils functions instead of urlparse
Change 3970d46:  Fix typos in oslo
Change 1771a77:  Adjust import order according to PEP8 imports rule
Change da611e6:  Transform the for loop to expression

Change-Id: If2bbb247f0202bae6dd5a8bd66d9708738e52d71