Add openpilot tests

panda/tests/health_test.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+import time
+from panda import Panda
+
+if __name__ == "__main__":
+  i = 0
+  pi = 0
+
+  panda = Panda()
+  while True:
+    st = time.monotonic()
+    while time.monotonic() - st < 1:
+      panda.health()
+      i += 1
+    print(i, panda.health(), "\n")
+    print(f"Speed: {i - pi}Hz")
+    pi = i
+