Add kubernetes podSpec support in fission spec (#1106)

test/tests/test_specs/test_spec_merge/specs/function-nodehellop.yaml

@@ -0,0 +1,50 @@
+include:
+- hello.js
+kind: ArchiveUploadSpec
+name: hello-js-leSC
+
+---
+apiVersion: fission.io/v1
+kind: Package
+metadata:
+  creationTimestamp: null
+  name: hello-js-vm2y
+  namespace: default
+spec:
+  deployment:
+    checksum: {}
+    type: url
+    url: archive://hello-js-leSC
+  environment:
+    name: nodep
+    namespace: default
+  source:
+    checksum: {}
+status:
+  buildstatus: none
+
+---
+apiVersion: fission.io/v1
+kind: Function
+metadata:
+  creationTimestamp: null
+  name: nodehellop
+  namespace: default
+spec:
+  InvokeStrategy:
+    ExecutionStrategy:
+      ExecutorType: poolmgr
+      MaxScale: 0
+      MinScale: 0
+      TargetCPUPercent: 0
+    StrategyType: execution
+  configmaps: null
+  environment:
+    name: nodep
+    namespace: default
+  package:
+    packageref:
+      name: hello-js-vm2y
+      namespace: default
+  resources: {}
+  secrets: null