DoDispose missing from certain classes.

[man...@gmail.com]

I noticed that in many classes proper clean up does not happen, such as

`nr-mac-scheduler-ns3.cc/.h' where `Ptr<Object>` have to be set to `nullptr` and various collections have to be cleared. This causes Valgrind to crash.

Is there a reason why?

[Tom Henderson]

Usually it is because the author did not test with valgrind (or the repository itself is not being tested with valgrind).  These kind of warnings cause a noisy valgrind output but are usually not consequential because the simulation process is in the midst of closing.  It becomes more important when such objects are being deleted in the middle of a simulation, because it can cause a memory leak.  However, it is good practice to clean these up and remove reference cycles so I'd suggest to submit patches where you find these missing implementations of DoDispose().

- Tom

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