bin/docker support warning message suppression from user config dir

The `bin/docker` command should also honor the presence of `$XDG_CONFIG_HOME/containers/nodocker` when considering whether it should print the warning message.

Signed-off-by: Nick Dimiduk <[email protected]>

docker/docker.in

@@ -1,4 +1,4 @@
 #!/bin/sh
-[ -e ${ETCDIR}/containers/nodocker ] || \
+[ -e ${ETCDIR}/containers/nodocker ] || [ -e "\${XDG_CONFIG_HOME-\$HOME/.config}/containers/nodocker" ] || \
 echo "Emulate Docker CLI using podman. Create ${ETCDIR}/containers/nodocker to quiet msg." >&2
 exec ${BINDIR}/podman "$@"