Update COVERAGE sed to latest daemonset which has nonempty env

test/840_weave_kube_3_test.sh

@@ -41,12 +41,12 @@ done
 if [ -n "$COVERAGE" ]; then
     COVERAGE_ARGS="env:\\n                - name: EXTRA_ARGS\\n                  value: \"-test.coverprofile=/home/weave/cover.prof --\""
 else
-    COVERAGE_ARGS="env: []"
+    COVERAGE_ARGS="env:"
 fi
 
 # Ensure Kubernetes uses locally built container images and inject code coverage environment variable (or do nothing depending on $COVERAGE):
 sed -e "s%imagePullPolicy: Always%imagePullPolicy: Never%" \
-    -e "s%env: \[\]%$COVERAGE_ARGS%" \
+    -e "s%env:%$COVERAGE_ARGS%" \
     "$(dirname "$0")/../prog/weave-kube/weave-daemonset-k8s-1.6.yaml" | run_on "$HOST1" "$KUBECTL apply -n kube-system -f -"
 
 sleep 5