PIM-3364 : normalize form handlers
PIM-3364 : fixcs
PIM-3364 : normalize group type and group handlers
PIM-3364 : inject completeness manager to channel manager
PIM-3364 : remove object manager from product builder
PIM-3364 : cosmetic in product controller
PIM-3364 : cosmetic in handlers
PIM-3364 : fix channel manager and completeness scheduling
PIM-3364 : replace channel manager unit test by specs
PIM-3364 : fix circular reference in Mongo completeness generator
PIM-3364 : add missing update in changelog
Merge pull request #1766 from akeneo/PIM-3364

PIM-3364 : normalize form handlers