Fix permission error while running bots

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@359405 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/docker/scripts/run_buildbot_new.sh b/utils/docker/scripts/run_buildbot_new.sh
index 92ec2ab..7030a53 100755
--- a/utils/docker/scripts/run_buildbot_new.sh
+++ b/utils/docker/scripts/run_buildbot_new.sh
@@ -69,6 +69,7 @@
   local BOT_DIR=$BOT_ROOT/b$N
   local BOT_NAME=$BOT_ROOT_NAME$N
   setup_numbered_bot $BOT_NAME $BOT_DIR
+  chown -R buildbot:buildbot $BOT_DIR/
   sudo -u buildbot /usr/bin/buildslave start $BOT_DIR
 
   sleep 30