[zen-92][zendframework/zf2#2012] Better ServiceLocator/ServiceManagerAware handling
[zen-92][zendframework/zf2#2012] Better ServiceLocator/ServiceManagerAware handling

- Combine both injections into a single initializer
- Use the plugin manager instance for both injections
- MVC should register its initializer to run later in the stack, to
  ensure it "wins" over the abstract plugin manager initializer

prolic/zend-servicemanager,akrabat/zend-servicemanager,matwright/zend-servicemanager,MadCat34/zend-servicemanager,weierophinney/zend-servicemanager