Provide a shortname to imagecontentsourcepolicy

Save people from typing 20 x N times makes me happy.
Not sure this is easy as this single line,

fixes openshift#622

operator/v1alpha1/0000_10_config-operator_01_imagecontentsourcepolicy.crd.yaml

@@ -11,6 +11,7 @@ spec:
     singular: imagecontentsourcepolicy
     plural: imagecontentsourcepolicies
     listKind: ImageContentSourcePolicyList
+    short: icsp
   versions:
   - name: v1alpha1
     served: true