health: add a 75s delay when applying a new config

Signed-off-by: John Crispin <john@phrozen.org>

renderer/templates/metric/health.uc

@@ -1,4 +1,8 @@
-{% if (!health) return %}
+{%
+	services.set_enabled("uhealth", true);
+	if (!health)
+		return;
+%}
 
 # Health configuration
 set ustats.health.interval={{ health.interval }}

renderer/ucentral.uc

@@ -33,6 +33,8 @@ try {
 			  'rm /tmp/dnsmasq.conf',
 			  'cp /etc/config-shadow/wireless /etc/config/wireless',
 			  '/etc/init.d/wpad restart',
+			  '/etc/init.d/uhealth stop',
+			  'touch /tmp/ucentral.health',
 			  'touch /tmp/dnsmasq.conf' ])
 		system(cmd);
 

system/health.uc

@@ -5,6 +5,11 @@ let fs = require("fs");
 let uci = require("uci");
 let ubus = require("ubus");
 
+if (length(fs.stat('/tmp/ucentral.health')))
+	sleep(75000);
+
+fs.unlink('/tmp/ucentral.health');
+
 state = {
 	unit: {},
 	interfaces: {}