Fix bug 1231: k8scluster-list now shows the project name it belongs to

Similar code was already used in different places, so it has been
properly refactored through the function get_project

Change-Id: I5b1299f27ca3e2eab3b3ba109a09ad8e66abae5b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>