Update init.g2.rc: set perms, user, & group for /sys + Add run-parts
as system service. Give all EXTERNAL_STORAGE & sdcard locations the
same perms, and symlink /storage/emulated/legacy first, to get rid
of /storage/emulated/legacy/0/0/0/0/0/0/0/0 problem, & the run-parts
permission denied errors.

Change-Id: I079214b2a1ac15be2430544bfbe847906732106b
Use androidboot.selinux=permissive for now, until I work out all selinux
problems.

Change-Id: I0d5fdc770e34f8aa01b146d8b9e7c097f26dde4c