Make installer work with Kustomize v3

kustomize/base/flagger/deployment.yaml

@@ -2,7 +2,6 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: flagger
-  namespace: flagger-system
 spec:
   replicas: 1
   strategy:

kustomize/tester/deployment.yaml

@@ -57,11 +57,3 @@ spec:
           securityContext:
             readOnlyRootFilesystem: true
             runAsUser: 10001
-#          volumeMounts:
-#            - name: tests
-#              mountPath: /bats
-#              readOnly: true
-#      volumes:
-#        - name: tests
-#          configMap:
-#            name: flagger-loadtester-bats

kustomize/tester/service.yaml

@@ -12,4 +12,4 @@ spec:
     - name: http
       port: 80
       protocol: TCP
-      targetPort: http
+      targetPort: http