dirty ratio suspend gc ver 1.0
remove old functions
add some sysfs attributes on f2fs_gc_kthread
add f2fs kobject attr gc_suspend
modify init.rc to change owner of /sys/fs/f2fs/mmcblk0p36/gc_suspend to system:system
add autosuspend_autosleep.c, libsuspend.so to backup directory
f2fs suspend gc ver 2.0
modify libsuspend: libsuspend can be generally used
modify gc_thread_func, ramdisk, some script files
modify debug.c, add gctester
add test result parsing scrtip