add option to choose prepend/append in merge

api/krusty/baseandoverlaymedium_test.go

@@ -225,13 +225,13 @@ spec:
     spec:
       containers:
       - env:
-        - name: foo
-          value: bar
         - name: FOO
           valueFrom:
             configMapKeyRef:
               key: somekey
               name: test-infra-app-env-8h5mh7f7ch
+        - name: foo
+          value: bar
         image: nginx:1.8.0
         name: nginx
         ports:

api/krusty/generatormergeandreplace_test.go

@@ -385,12 +385,12 @@ spec:
       - gcePersistentDisk:
           pdName: nginx-persistent-storage
         name: nginx-persistent-storage
-      - configMap:
-          name: staging-team-foo-configmap-in-base-hc6g9dk6g9
-        name: configmap-in-base
       - configMap:
           name: staging-configmap-in-overlay-dc6fm46dhm
         name: configmap-in-overlay
+      - configMap:
+          name: staging-team-foo-configmap-in-base-hc6g9dk6g9
+        name: configmap-in-base
 ---
 apiVersion: v1
 kind: Service

api/krusty/multiplepatch_test.go

@@ -146,12 +146,12 @@ spec:
       - gcePersistentDisk:
           pdName: nginx-persistent-storage
         name: nginx-persistent-storage
-      - configMap:
-          name: a-b-configmap-in-base-798k5k7g9f
-        name: configmap-in-base
       - configMap:
           name: a-configmap-in-overlay-dc6fm46dhm
         name: configmap-in-overlay
+      - configMap:
+          name: a-b-configmap-in-base-798k5k7g9f
+        name: configmap-in-base
 ---
 apiVersion: v1
 kind: Service
@@ -351,12 +351,12 @@ spec:
       - gcePersistentDisk:
           pdName: nginx-persistent-storage
         name: nginx-persistent-storage
-      - configMap:
-          name: staging-team-foo-configmap-in-base-798k5k7g9f
-        name: configmap-in-base
       - configMap:
           name: staging-configmap-in-overlay-dc6fm46dhm
         name: configmap-in-overlay
+      - configMap:
+          name: staging-team-foo-configmap-in-base-798k5k7g9f
+        name: configmap-in-base
 ---
 apiVersion: v1
 kind: Service