make_dev_ssd.sh: Remind user to reboot after using this script.

I have one too many times being bitten by forgetting to reboot
my DUT between running this tool and trying to flash a new kernel.

Make the script remind me of this requirement.

BRANCH=none
BUG=none
TEST=ran script, saw new output

Change-Id: I5c4738317087ec7654b13c1c9c3cd67273ba3bf1
Signed-off-by: Enrico Granata <egranata@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1330016
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
diff --git a/scripts/image_signing/make_dev_ssd.sh b/scripts/image_signing/make_dev_ssd.sh
index 39e7a52..42b90a5 100755
--- a/scripts/image_signing/make_dev_ssd.sh
+++ b/scripts/image_signing/make_dev_ssd.sh
@@ -498,6 +498,7 @@
     # signed something at least
     info "Successfully re-signed ${num_signed} of ${num_given} kernel(s)" \
       " on device ${FLAGS_image}."
+    info "Please remember to reboot before updating the kernel on this device."
   else
     die "Failed re-signing kernels."
   fi