Having a http verb to know when a worker is up and configure is terminated

[dezmou]

I'm submitting a ... (check one with "x")

[ ] bug report => search github for a similar issue or PR before submitting
[x] feature request

Scope (check one with "x")

[x] @zetapush/cli
[ ] @zetapush/cometd
[ ] @zetapush/client
[ ] @zetapush/create
[ ] @zetapush/platform
[ ] @zetapush/worker

Current behavior
In the integrations test, we use "waitForWorkerUp" which resolve when worker is up

Expected behavior
waitForWorkerUp should resolve when worker is up and all onApplicationBoostrap are terminated

What is the motivation / use case for changing the behavior?
The branch feature/adding-tests will be mergeable once waitForWorkerUp will be fixed