Make ServicePrimProc a singleton available in ExeMgr facilities

There is a class called ServicePrimProc(primitiveserver.cpp).
This class should contain a pointer to thread pools used by PrimProc, namely two PriorityThreadPools: procPoolPtr and OOBPool to facilitate the current workload calculation.
To enable information exchange b/w EM and PP that co-exists in a common runtime one needs to make a global pointer to the ServicePrimProc instances used.