Fix basic-deployment kuttl assert

Currently the way kuttl test is written , it will still pass if no status code is
returned as script doesn't have proper exit mechanism to handle that . This PR fixes that
and introduce proper error message . Also fixes the command to run in required namespace

tests/kuttl/common/assert-sample-deployment.yaml

@@ -19,9 +19,14 @@ commands:
       set -x
       RETURN_CODE=0
       PUBLIC_URL=$(oc get -n $NAMESPACE horizon horizon -o jsonpath='{.status.endpoint}')
-      STATUSCODE=$(oc exec -it deployment/horizon -- curl --silent --output /dev/stderr --head --write-out "%{http_code}" "$PUBLIC_URL/dashboard/auth/login/?next=/dashboard/" -k)
-      if test $STATUSCODE -ne 200; then
+      STATUSCODE=$(oc -n $NAMESPACE exec -it deployment/horizon -- curl --silent --output /dev/stderr --head --write-out "%{http_code}" "$PUBLIC_URL/dashboard/auth/login/?next=/dashboard/" -k)
+      if [${STATUSCODE} ]; then
+          if test $STATUSCODE -ne 200; then
+              RETURN_CODE=1
+              echo "${PUBLIC_URL} status code expected is 200 but was ${STATUSCODE}"
+          fi
+      else
           RETURN_CODE=1
-          echo "${PUBLIC_URL} status code expected is 200 but was ${STATUSCODE}"
-      fi
+          echo "No status code returned, pls check if horizon is available"
+      fi   
       exit $RETURN_CODE