sal-netconf-connector fails when instantiated using currentconfig.xml

CONTROLLER-459 was fixed using workaround that gets DataProviderService from OSGi service registry. This works fine using initial config, but after controller.currentconfig.xml is created (e.g. empty commit), this is not guaranteed to work, because of ordering of module instantiation during config 2PC.

Use config's DI mechanism instead. Also check all other md-sal components that fish for dependencies using OSGi SR.