Update AGENT_ALLOW_RUNASROOT to RUNNER_ALLOW_RUNASROOT (#227)

* Update config.sh

* Update run.sh

Author: TingluoHuang

src/Misc/layoutroot/config.sh

@@ -3,7 +3,7 @@
 user_id=`id -u`
 
 # we want to snapshot the environment of the config user
-if [ $user_id -eq 0 -a -z "$AGENT_ALLOW_RUNASROOT" ]; then
+if [ $user_id -eq 0 -a -z "$RUNNER_ALLOW_RUNASROOT" ]; then
     echo "Must not run with sudo"
     exit 1
 fi

src/Misc/layoutroot/run.sh

@@ -2,7 +2,7 @@
 
 # Validate not sudo
 user_id=`id -u`
-if [ $user_id -eq 0 -a -z "$AGENT_ALLOW_RUNASROOT" ]; then
+if [ $user_id -eq 0 -a -z "$RUNNER_ALLOW_RUNASROOT" ]; then
     echo "Must not run interactively with sudo"
     exit 1
 fi