Circuit tests now report link quality. Also fixed a little thing in revocation propagation.

include/ZeroTierOne.h

@@ -1270,6 +1270,11 @@ typedef struct {
 	 */
 	struct sockaddr_storage receivedFromRemoteAddress;
 
+	/**
+	 * Path link quality of physical path over which test was received
+	 */
+	int receivedFromLinkQuality;
+
 	/**
 	 * Next hops to which packets are being or will be sent by the reporter
 	 *