Use a hashed MAC address instead of IMEI for stats collection.

PS2: always use hashed Wifi MAC address to avoid zombies when wiping

Change-Id: I7379c5b380273e35b5aab582f5268d6946e0a255
Adjust aokpstats

Change-Id: I7f40da5313b0754862aab40db06555d752a719d8
Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>