Use nemo namespace by default in the sample CR

Signed-off-by: Shiva Krishna, Merla <smerla@nvidia.com>

Author: shivamerla

config/samples/apps_v1alpha1_nemodatastore.yaml

@@ -5,6 +5,7 @@ metadata:
     app.kubernetes.io/name: k8s-nim-operator
     app.kubernetes.io/managed-by: k8s-nim-operator
   name: nemodatastore-sample
+  namespace: nemo
 spec:
   authSecret: ngc-image-pull-secret
   secrets: