Fix spec doesn't update status of failed package when applying spec files (#1332)

Previously, the spec doesn't update the package status if nothing
in the spec file changed. Due to this, the failed package will
always stay in the failed state.

This PR adds a check to see whether a package is in the failed state.
If yes, then changes the state to pending for builder manager to rebuild it.

examples/go/specs/env.yaml

@@ -7,7 +7,6 @@ spec:
   version: 2
   builder:
     command: build
-    image: fission/go-builder:0.6.0
+    image: fission/go-builder-1.12:1.5.0
   runtime:
-    image: fission/go-env:0.6.0
-
+    image: fission/go-env-1.12:1.5.0

examples/go/specs/function-hello.yaml

@@ -31,6 +31,7 @@ spec:
   environment:
     name: go
     namespace: default
+  functionTimeout: 60
   package:
     functionName: Handler
     packageref: