And CPU affinity.
Also, use mlockall to keep our memory from being swapped out.

This commit contains work done by Eurecom and by Benetel.

This change is to enable use of gprof which requires the process
call `exit` to write out the collected data.

The UE (lte-uesoftmodem) exits cleanly, but the eNB
(lte-softmodem) crashes as it tries to shut down...

Found by valgrind.

Using the basic simulator and valgrind, it was found that
the lack of initialization of those two pointers leads to
some very nasty behavior of some other parts of the system.