DEV: overlay2 is the recommended storage engine not aufs

DEV: overlay2 is the recommended storage engine not aufs

overlay2 is supported in all latest kernels and the default storage engine for new installs of docker.

Recommend it.

diff --git a/launcher b/launcher
index 0153305..4681ca8 100755
--- a/launcher
+++ b/launcher
@@ -170,7 +170,7 @@ check_prereqs() {
   # 2. running an approved storage driver?
   if ! $docker_path info 2> /dev/null | egrep -q 'Storage Driver: (aufs|zfs|overlay2)$'; then
     echo "Your Docker installation is not using a supported storage driver.  If we were to proceed you may have a broken install."
-    echo "aufs is the recommended storage driver, although zfs and overlay2 may work as well."
+    echo "overlay2 is the recommended storage driver, although zfs and aufs may work as well."
     echo "Other storage drivers are known to be problematic."
     echo "You can tell what filesystem you are using by running \"docker info\" and looking at the 'Storage Driver' line."
     echo

GitHub sha: 76ef2cbb