Replace openstack single clients by python-openstackcclient

Replace openstack single clients by python-openstackcclient

Some projects like Promise need to use the openstack cli directly.
This requirement will also install automatically the following dependent clients:
python-cinderclient (1.5.0)
python-glanceclient (1.2.0)
python-keystoneclient (2.1.1)
python-neutronclient (4.0.0)
python-novaclient (3.2.0)
python-openstackclient (2.0.0)

Change-Id: I6836b8765364b30ae877ec4d1e8d88c8927b030d
Signed-off-by: jose.lausuch <jose.lausuch@ericsson.com>
(cherry picked from commit ff89aea46827ac2fc81429354ad28dfbb4c57fe3)