RPKI: Fix unnecessary reconnection on reconfiguration

Compare the new timing parameters with the old configuration, not with
the temporary state of the current connection.

The timing values in struct rpki_cache is updated by a version 1 End Of
Data PDU, unless this behavior is suppressed by the configuration
explicitly by the "keep" keyword. Consequently, every reconfiguration
of BIRD triggers a reconnection even if it is not necessary.

proto/rpki/rpki.c

@@ -701,7 +701,7 @@ rpki_reconfigure_cache(struct rpki_proto *p UNUSED, struct rpki_cache *cache, st
 #endif
 
 #define TEST_INTERVAL(name, Name) 						\
-    if (cache->name##_interval != new->name##_interval ||			\
+    if (old->name##_interval != new->name##_interval ||				\
 	old->keep_##name##_interval != new->keep_##name##_interval) 		\
     { 										\
       cache->name##_interval = new->name##_interval;				\