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/bad-rsa-2048.pem b/samples/zephyr/bad-keys/bad-rsa-2048.pem
new file mode 100644
index 0000000..755f95b
--- /dev/null
+++ b/samples/zephyr/bad-keys/bad-rsa-2048.pem
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAzXhCIc6kig0DRWEyKj4N8v/bfvh/RmU73Jo0Z0RAFSLnFrE5
+5W5C9tsdDalhN5HV7xBQCzr7GSW1C6MNvtw/lVr4+x4LvgwYD6kl+9IZc5udPIJ1
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+yVIXA1h3vfP2gDKeA3GxCRko4zBL1vTNVsJGx+XeAAYk0suwAp0NGmTXiWlDC4hw
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+eDaBljdlXDJnKvBqjOVQyU7lrZAIVWgz6qD1HNIQZI30WivXejL4GeoXnAnp/ohh
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+xVL3usz2cjlc+IZpxFs3JeZlYnuRzcNgJFispiJDpul7FHXFK6YjpxjDwldkilVp
+NGLHNOXCAQfpIF/mRqOTGBECgYAmb7kMp5d58WcwNN2iYw/bFTcHkkNDZLUJq5Qw
+ZfYdqMA3RF8ms3hrNjvLO8P9Eb2angI270dwP2fQ3uBUXNdvvb/zF2KC4zZPMGJ6
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+ZYhcMQKBgEHN3ZYe7gOfxR4rqk+OIsAUN9P3zyu6kQzUL1BQ7t7Gwi1dv6+E+BGQ
+vGUt4RGG10g3K9twfhOHnwAiruEk6CK2+1G/ZsGCrPIE21KCcucUCPvzUGhintO+
+b+Q5kAeZFg5CB9b616SY/GvlzPraNx5OZfI8nw39U9do7N/yFiKT
+-----END RSA PRIVATE KEY-----
\ No newline at end of file