[V2] Initialize services by default

[LoicPoullain]

Issue

Services can be initialized using their boot method. For this to work, we currently need to call ServicesManager.boot() in src/index.ts.

In version 2, this feature is enabled by default. No need to call ServicesManager.boot() anymore.

Solution and steps

• Call ServiceManager.boot in createAndInitApp.
• Use MongoDBStore.boot.
• Use RedisStore.boot.
• Use createAndInitApp in acceptance tests.

How to upgrade (to include in v2 release)

If you use the boot feature, remove the ServiceManager.boot() call from src/index.ts

If you do not use the boot feature, the property boot in every service/controller is now a reserved keyword (cf service initialization).

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.