Fix ConfigMap name clash if env_file name is equal (#2001)

* Fix ConfigMap name clash if env_file name is equal #2000

* Generate envFrom instead of single env entries from env_file entries #1999

* Fix failing test fixture outputs

script/test/fixtures/configmap-pod/output-k8s.yaml

@@ -23,22 +23,11 @@ metadata:
   name: redis
 spec:
   containers:
-    - env:
-        - name: ALLOW_EMPTY_PASSWORD
-          valueFrom:
-            configMapKeyRef:
-              key: ALLOW_EMPTY_PASSWORD
-              name: foo-env
-        - name: BAR
-          valueFrom:
-            configMapKeyRef:
-              key: BAR
-              name: bar-env
-        - name: FOO
-          valueFrom:
-            configMapKeyRef:
-              key: FOO
-              name: bar-env
+    - envFrom:
+        - configMapRef:
+            name: foo-env
+        - configMapRef:
+            name: bar-env
       image: bitnami/redis:latest
       name: redis
       ports:

script/test/fixtures/configmap-pod/output-os.yaml

@@ -23,22 +23,11 @@ metadata:
   name: redis
 spec:
   containers:
-    - env:
-        - name: ALLOW_EMPTY_PASSWORD
-          valueFrom:
-            configMapKeyRef:
-              key: ALLOW_EMPTY_PASSWORD
-              name: foo-env
-        - name: BAR
-          valueFrom:
-            configMapKeyRef:
-              key: BAR
-              name: bar-env
-        - name: FOO
-          valueFrom:
-            configMapKeyRef:
-              key: FOO
-              name: bar-env
+    - envFrom:
+        - configMapRef:
+            name: foo-env
+        - configMapRef:
+            name: bar-env
       image: bitnami/redis:latest
       name: redis
       ports: