Added converting project name to project id
Added converting project name to project id

Added converting project name to project id for getting correct URL for
savanna.
Added exception if project name and id is empty.

Change-Id: I9d759d55dbcedbcccf7420923233435a0c25f0ec

openstack/python-saharaclient,citrix-openstack-build/python-saharaclient,citrix-openstack-build/python-saharaclient,citrix-openstack-build/python-saharaclient