Provide a way to disable periodic configuration file reread.

poller

@@ -50,7 +50,7 @@ while (1) {
     }
 
     # set flags to cause a config reload every reload interval
-    catch_hup() unless ++$do_reload_every%$reload_interval;
+    catch_hup() unless !$reload_interval or ++$do_reload_every%$reload_interval;
 
     do_maint() if ($need_maint);
 
@@ -255,8 +255,8 @@ so be sure to include a trailing slash if it is.
 
 =item B<-r> I<count>
 
-Re-read the configuration file after every I<count> polls of the systems.
-The default value is 10.
+Reread the configuration file after every I<count> polls of the systems.
+The default value is 10. A value of zero disables the reread feature.
 
 =item B<-s>