Add mynewt testplan

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/testplan/mynewt/key_ec.pem b/testplan/mynewt/key_ec.pem
new file mode 100644
index 0000000..7307800
--- /dev/null
+++ b/testplan/mynewt/key_ec.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MGgCAQEEHKDCA+0fUA9P6MkTZvGlO4IN8kQfMbD4xyt619WgBwYFK4EEACGhPAM6
+AASgjFrWmCAa1bnE/X+l0wjKAJFexpJJzhjFZBftv2PQzbj3/yklNVp6IDDJJpWy
+V9FGDWkYE8l9sw==
+-----END EC PRIVATE KEY-----