clientlog: add NTS-KE service

Instead of sharing the NTP rate limiting with NTS-KE, specify a new
service for NTS-KE and use it in the NTS-KE server.

Add ntsratelimit directive for configuration.

clientlog.c

@@ -44,7 +44,7 @@
 #include "util.h"
 #include "logging.h"
 
-#define MAX_SERVICES 2
+#define MAX_SERVICES 3
 
 typedef struct {
   IPAddr ip_addr;
@@ -329,6 +329,10 @@ CLG_Initialise(void)
         if (!CNF_GetNTPRateLimit(&interval, &burst, &lrate))
           continue;
         break;
+      case CLG_NTSKE:
+        if (!CNF_GetNtsRateLimit(&interval, &burst, &lrate))
+          continue;
+        break;
       case CLG_CMDMON:
         if (!CNF_GetCommandRateLimit(&interval, &burst, &lrate))
           continue;