Add health-check tool

contrib/health_check.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+import argparse
+import client
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("host")
+    parser.add_argument("port", type=int)
+    args = parser.parse_args()
+
+    conn = client.Client((args.host, args.port))
+    print(conn.call("server.version", "health_check", "1.4")["result"])
+
+if __name__ == '__main__':
+	main()