cpu-sched: Support cpu affinity pinning for App

cpu-sched: Support cpu affinity pinning for App

This patch includes:
  - Parse configuration(s) of per app cpu affinity (config-parser.c/h)
  - Update of README to reflect per App cpu affinity (README)
  - Register cpu affinity fixed app in the list (cpu-sched.c)
  - Read /sys/devices/system/cpu/online to know onlie cpuset and
	reflect the current online cpuset info to cpuset cgroup

Per app cpu affinity pinning is different from foreground cpu affinity
  - foreground cpu affinity: pinning cpu affinity for foreground status apps
    * foreground app status detect -> pinning cpu affinity
  - per App cpu affinity: pinning cpu affinity for fixed apps
  regardless of app status
	* app launch detect -> pinning cpu affinity

Change-Id: Ibef926c5b40049ce00b97cf2ba74f83784efdccd
Signed-off-by: Unsung Lee <unsung.lee@samsung.com>