For the template:
{
  "kind": "Template",
  "apiVersion": "v1beta3",
  "metadata": {
    "name": "simple",
    "creationTimestamp": null,
    "annotations": {
      "description": "Simple Template"
    }
  },
	"postProcessMessage" : "Your admin credentials are ${ADMIN_USERNAME}:${ADMIN_PASSWORD}",
  "objects": [
{
    "kind": "Secret",
    "apiVersion": "v1",
    "metadata": {
        "name": "testsecret",
        "creationTimestamp": null
    },
    ....


The output of new-app
[root@localhost origin]# oc new-app --template=simple
--> Deploying template simple for "simple"
     With parameters:
      ADMIN_USERNAME=admin8RT # generated
      ADMIN_PASSWORD=Mw2hwJak # generated
      REDIS_PASSWORD=Xt4Jh81h # generated
      SLAVE_SERVICE_NAME=redis-slave
     Message: Your admin credentials are admin8RT:Mw2hwJak
--> Creating resources ...
    secret "testsecret" created
    secret "testsecret2" created
--> Success
    Run 'oc status' to view your app.

    secret "testsecret2" created
--> Success
    Run 'oc status' to view your app.