Add mynewt testplan

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/testplan/mynewt/key_ec256_2.pem b/testplan/mynewt/key_ec256_2.pem
new file mode 100644
index 0000000..da05302
--- /dev/null
+++ b/testplan/mynewt/key_ec256_2.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEICDt9+UM3LnshnbYzo73AGTWav9ZmRYDydJAarzx4Og8oAoGCCqGSM49
+AwEHoUQDQgAEDv6jJOUwhCpzEH3T7yWlAOZRTLIlC0q/JMHyJR0PkPMS+eyq7fEp
+hOnAXbCNx5PLyVLR2NSnOU1A6QiLHW1j0A==
+-----END EC PRIVATE KEY-----