New push-helper hook is not supported

[Roberto Alsina]

When creating a click package with push notifications support, it needs to add a helper with its own hook and both the SDK and the click review tool get confused.

The manifest is something like this:

{
    "name": "com.ubuntu.developer.ralsina.hello",
    "description": "description of hello",
    "framework": "ubuntu-sdk-14.10-qml-dev2",
    "architecture": "all",
    "title": "hello",
    "hooks": {
        "hello": {
            "apparmor": "hello.json",
            "desktop": "hello.desktop"
        },
        "helloHelper": {
            "apparmor": "helloHelper-apparmor.json",
            "push-helper": "helloHelper.json"
        }
    },
    "version": "0.2",
    "maintainer": "Roberto Alsina <email address hidden>"
}

The click review tool will complain about missing desktop hooks for the push helper:

[15:59:18] <beuno> = hooks =
[15:59:18] <beuno> ERROR: could not find desktop hook for 'helloHelper'
[15:59:37] <beuno> "error": {
[15:59:38] <beuno> "lint_control_architecture_valid_contents": {
[15:59:38] <beuno> "text": "found binaries for architecture 'all': lib/i386-linux-gnu/hello/libhellobackend.so"
[15:59:40] <beuno> },
[15:59:43] <beuno> "lint_hooks": {
[15:59:45] <beuno> "text": "more than one app key specified in hooks"
[15:59:48] <beuno> }
[15:59:50] <beuno> },
[15:59:51] <beuno> ERROR: Could not load 'helloHelper-apparmor.json'. Is it properly formatted?

And the SDK will complain about "The manifest file needs to specify if this is a app or a scope"