Add labels during namespace creation

[johscheuer]

During debugging #98 I noticed that the namespace are not created properly:

$ kubectl get ns --show-labels
NAME                             STATUS   AGE   LABELS
default                          Active   3h    <none>
illuminatio                      Active   3h    <none>
illuminatio-inverted-roleadmin   Active   9m    illuminatio-cleanup=on-request
illuminatio-inverted-staging     Active   9m    illuminatio-cleanup=on-request
kube-public                      Active   3h    <none>
kube-system                      Active   3h    <none>
roleadmin                        Active   9m    illuminatio-cleanup=on-request
staging                          Active   3h    <none>

after the patch the labels are applied to the namespaces e.g. role=admin:

$ kubectl get ns --show-labels
NAME                             STATUS   AGE   LABELS
default                          Active   3h    <none>
illuminatio                      Active   3h    <none>
illuminatio-inverted-roleadmin   Active   16s   illuminatio-cleanup=on-request,illuminatio-inverted-role=admin
illuminatio-inverted-staging     Active   16s   illuminatio-cleanup=on-request
kube-public                      Active   3h    <none>
kube-system                      Active   3h    <none>
roleadmin                        Active   16s   illuminatio-cleanup=on-request,role=admin
staging                          Active   3h    <none>

[maxbischoff]

LGTM