Travis runs Docker just on the Unix socket, not on TCP

script/travis

@@ -13,7 +13,7 @@ env
 trap 'kill $(jobs -p)' SIGINT SIGTERM EXIT
 
 # Start docker daemon
-docker -d -H 0.0.0.0:4243 -H unix:///var/run/docker.sock 2>> /dev/null >> /dev/null &
+docker -d -H unix:///var/run/docker.sock 2>> /dev/null >> /dev/null &
 sleep 2
 
 # $init is set by sekexe