Add Kptfile to each sub directory, the kptfile contains functions to mutate project ID

Author: yuwenma

porch/config/samples/packages/environment/config-control/Kptfile

@@ -0,0 +1,11 @@
+apiVersion: kpt.dev/v1
+kind: Kptfile
+metadata:
+  name: config-control
+info:
+  description: sample description
+pipeline:
+  mutators:
+  - image: gcr.io/kpt-fn-demo/set-project-id:v0.1-justin
+    configMap:
+      projectID: justinsb

porch/config/samples/packages/environment/project-specific/Kptfile

@@ -0,0 +1,14 @@
+apiVersion: kpt.dev/v1
+kind: Kptfile
+metadata:
+  name: project-specific
+info:
+  description: sample description
+pipeline:
+  mutators:
+  - image: gcr.io/kpt-fn-demo/set-project-id:v0.1-justin
+    configMap:
+      projectID: project-id
+  - image: gcr.io/kpt-fn/set-namespace:v0.2
+    configMap:
+      namespace: project-id