Update upstart init script to start on filesystem (not only on local ones).

Signed-off-by: Julien Pervillé <julien.perville@perfect-memory.com>

contrib/init/upstart/docker.conf

@@ -1,6 +1,6 @@
 description "Docker daemon"
 
-start on (local-filesystems and net-device-up IFACE!=lo)
+start on (filesystem and net-device-up IFACE!=lo)
 stop on runlevel [!2345]
 limit nofile 524288 1048576
 limit nproc 524288 1048576