add run_in_cgroup script for other easy use

cgproxy.sh

@@ -5,8 +5,12 @@ source $config
 
 # test suid bit
 if [ -u "$(which cgattach)" ]; then 
-    cgattach $$ $proxy_cgroup
+    cgattach $$ $proxy_cgroup && attached=1
 else
-    sudo cgattach $$ $proxy_cgroup
+    sudo cgattach $$ $proxy_cgroup && attached=1
 fi
-$@
+
+# test attach success or not
+[[ -z "$attached" ]] && echo "config error" && exit 1
+
+exec "$@"