Merge pull request #6873 from tianon/6836-fix-systemd-socket-perms

Fix the systemd socket activation socket permissions

contrib/init/systemd/socket-activation/docker.socket

@@ -3,6 +3,9 @@ Description=Docker Socket for the API
 
 [Socket]
 ListenStream=/var/run/docker.sock
+SocketMode=0660
+SocketUser=root
+SocketGroup=docker
 
 [Install]
 WantedBy=sockets.target