zephyr: Move testplan into sample Makefile
Instead of a bunch of patches that tend to become conflicting, use the
newly parameterized Makefile to make all of the test plans into make
targets. Update the instructions to match this.
Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/samples/zephyr/bad-keys/README.md b/samples/zephyr/bad-keys/README.md
new file mode 100644
index 0000000..621ce96
--- /dev/null
+++ b/samples/zephyr/bad-keys/README.md
@@ -0,0 +1,6 @@
+# Bad keys for testing
+
+This directory contains some alternate keys that can be used for
+testing. Signing the images with either of these keys, but leaving
+the demo keys's public keys in the bootloader should result in it not
+upgrading, or not booting.