UPSTREAM: <carry>: Define the suggested namespace for NMState CR

knmstate can be realistically installed only in a single instance on the
cluster. Currently, when creating an NMState CR, user is asked to define
the namespace. We can make this easier for them by pre-populating the
namespace to our default - openshift-nmstate.

Signed-off-by: Petr Horáček <phoracek@redhat.com>
(cherry picked from commit 0709939)
(cherry picked from commit 38b3cec)

manifests/4.9/kubernetes-nmstate-operator.v4.9.0.clusterserviceversion.yaml

@@ -15,6 +15,7 @@ metadata:
           }
         }
       }]
+    operatorframework.io/suggested-namespace: openshift-nmstate
     capabilities: Basic Install
     certified: "false"
     categories: OpenShift Optional