cgroup: refactor, use a unified hierarchy for finit

As of now, the default finit cgroup behavior is to use a unified
hierarchy of controllers under /sys/fs/cgroup/finit.

We mount cpu,cpuacct,cpuset,memory (if available) and gain the
ability to control our three major groups: init, system, user.

The default CPU share setup is ~10% for init and user, and 90% for
system.  These are guaranteed CPU shares to ensure we do not starve
PID 1 or user processes.  Support for configuring these limits will
be added in a later commit.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/cgreaper.sh

@@ -2,10 +2,10 @@
 # Called by kernel when last child in cgroup exists
 
 BASE=/sys/fs/cgroup/finit
-PROC=`basename $1`
+PROC=$(basename "$1")
 DIR="$BASE$1"
 
 #/libexec/finit/logit -p daemon.info -t finit "$PROC stopped, cleaning up control group $DIR"
-rmdir $DIR
+rmdir "$DIR"
 
 exit 0