Add upstart nofile/noproc similar to systemd init

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)

contrib/init/upstart/docker.conf

@@ -2,6 +2,8 @@ description "Docker daemon"
 
 start on filesystem
 stop on runlevel [!2345]
+limit nofile 524288 1048576
+limit nproc 524288 1048576
 
 respawn