Update setup.py and dependencies

Update setup.py and dependencies

Fixes dependency problem with python-openstackclient
Freezes requirements to use latest/current upstream versions

Yardstick can be installed with:

$ python setup.py install

or with:

$ easy_install -U pip
$ pip install -r ci/requirements.txt
$ pip install .      (or for develop mode: pip install -e .)

if fixed package versions are required

Change-Id: I9cb44d29011509c9c388dc2e7dc8bb60ee25e790
JIRA:-
Signed-off-by: Jo¶rgen Karlsson <jorgen.w.karlsson@ericsson.com>