Fixes #19229: Deadlock at start when loading new licence

[fanf]

https://issues.rudder.io/issues/19229

So, I wasn't able to reproduce the problem, and that PR is a bit of testing from what I know can lead to that given the thread dump @ncharles got.

My best guess is that the lazy val in the object + runNow is the root of the problem. We had that problem (hard to debug) in other tickets (https://issues.rudder.io/issues/17228).

So: change the lazy val for cache.

There was other problems in the services init that are unlikely to be linked to the deadlock, but who knows?

• don't use hardcoded path (moreover, it can be a problem in security audit), use them in class parameters;
• there was a class for whose package declaration and directory tree was not matching, which is known to lead to strange things in the JVM/Classloaders.
• there was duplicated resources (in toserve/branding and branding/toserve),

[fanf]

this is likely the culprit

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder-plugins/pull/380
-- Your faithful QA
Kant merge: "Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/40141/console)

[fanf]

OK, merging this PR