lrdp_v2: slabinfo.py execution time optimization.

Changed slabinfo.py to print only allocated objects.
Printing free objects call stack is optional now(based
on commandline option). print object address - FREE and
ALLOCATED  in a file.
Print unique callstack of objects in slab only once.

Change-Id: I76079c6d0a09ee362ca29f6d785439f4f1f4294c