Port to python-requests

Currently, httplib implementation does not support SSL certificate
verification. This patch fixes this. Note that ssl compression parameter
and 100-continue thing is still missing from requests, though those are
lower priority.

Requests now takes care of:
* proxy configuration (get_environ_proxies),
* chunked encoding (with data generator),
* bulk uploading (with files dictionary),
* SSL certificate verification (with 'insecure' and 'cacert' parameter).

This patch have been tested with requests 1.1.0 (CentOS 6) and requests
2.2.1 (current version).

Change-Id: Ib5de962f4102d57c71ad85fd81a615362ef175dc
Closes-Bug: #1199783
DocImpact
SecurityImpact
Rename Openstack to OpenStack

Change-Id: I091b1d2de41ff59b21ce136738e2f69b759d682b
Remove extraneous vim configuration comments

Remove line containing

comment - # vim: tabstop=4 shiftwidth=4 softtabstop=4

Change-Id: I31e4ee4112285f0daa5f2dd50db0344f4876820d
Closes-Bug:#1229324
Merge "Remove extraneous vim configuration comments"
Merge "Port to python-requests"