docker.js and services.js: async'ify

src/cron.js

@@ -75,7 +75,7 @@ async function startJobs() {
 
     gJobs.diskSpaceChecker = new CronJob({
         cronTime: '00 30 * * * *', // every 30 minutes. if you change this interval, change the notification messages with correct duration
-        onTick: () => system.checkDiskSpace(NOOP_CALLBACK),
+        onTick: async () => await safe(system.checkDiskSpace()),
         start: true
     });
 
@@ -112,7 +112,7 @@ async function startJobs() {
 
     gJobs.schedulerSync = new CronJob({
         cronTime: constants.TEST ? '*/10 * * * * *' : '00 */1 * * * *', // every minute
-        onTick: scheduler.sync,
+        onTick: async () => await safe(scheduler.sync()),
         start: true
     });
 
@@ -124,7 +124,7 @@ async function startJobs() {
 
     gJobs.appHealthMonitor = new CronJob({
         cronTime: '*/10 * * * * *', // every 10 seconds
-        onTick: appHealthMonitor.run.bind(null, 10, NOOP_CALLBACK),
+        onTick: async () => await safe(appHealthMonitor.run(10)), // 10 is the max run time
         start: true
     });