Declare a Runtime property for StatusReporter in Environment

`reporter` field is initialized in Environment's `initialize` method, 
however it was not declared.
This caused the property to private, i.e. unaccessible from other 
classes.
Declaring it with `Runtime` usage solves the problem

Change-Id: Iee74139bb143bd3891bce8e317ef7c047ecf2517
Closes-bug: #1326363