Remove conflicting imports and resolve relative to root namespace
Remove conflicting imports and resolve relative to root namespace

- No need to import Zend\ServiceManager\Initializer; it's a subnamespace
  of the current namespace already.
- Resolve AbstractFactoryInterface and DelegatorFactoryInterface
  relative to `Factory` subnamespace to prevent naming collisions. These
  only affect docblocks anyways. (Fixes issues observed in two separate,
  3rd party packages when testing against the class.)

MadCat34/zend-servicemanager