do not require privileged iso container

* The init call w/ privileged was causing my laptop to wig out. This
changeset still functions w/ out requiring privileged access.

tools/docker-isolated/Dockerfile

@@ -27,4 +27,7 @@ RUN ssh-keygen -A
 RUN mkdir -p /root/.ssh
 RUN touch /root/.ssh/authorized_keys
 
+STOPSIGNAL SIGRTMIN+3
+
+
 CMD ["/usr/sbin/init"]