Update init.g2.rc: set perms, user, & groups for /sys and add run-parts
service. Also symlink EXTERNAL_STORAGE location before sdcard locations,
& give all 3 locations the same perms, since they all are same, hoping
to get rid of /storage/emulated/legacy/0/0/0/0/0/0 problem, & run-parts
permission denied errors.

Change-Id: I079214b2a1ac15be2430544bfbe847906732106b