Update gazebo

Updating default command and entrypoint

library/gazebo

@@ -1,6 +1,6 @@
 # maintainer: Nate Koenig <[email protected]> (@nkoenig)
 
-gzserver5:      git://github.com/osrf/docker_images@c304e7f3f51662e25e49437eab3c1bbdff3f78fc gazebo/gazebo5/gzserver5
-latest:         git://github.com/osrf/docker_images@c304e7f3f51662e25e49437eab3c1bbdff3f78fc gazebo/gazebo5/gzserver5
+gzserver5:      git://github.com/osrf/docker_images@bfaaed5d6ae0d1118b576e76f55dafca48a0ef01 gazebo/gazebo5/gzserver5
+latest:         git://github.com/osrf/docker_images@bfaaed5d6ae0d1118b576e76f55dafca48a0ef01 gazebo/gazebo5/gzserver5
 # Docker EOL: 2019-04-30
 # LTS