fix: clear timeouts before existing

Closes #3644

lib/manager/travis/package.js

@@ -50,7 +50,10 @@ for (const data of Object.values(nodeJsSchedule)) {
       const offsetmilliseconds = 1 + fieldDate.getTime() - initTime.getTime();
       // istanbul ignore if
       if (offsetmilliseconds < 10000000000) {
-        setTimeout(generatePolicies, offsetmilliseconds);
+        global.renovateTimers = global.renovateTimers || [];
+        global.renovateTimers.push(
+          setTimeout(generatePolicies, offsetmilliseconds)
+        );
       }
     }
   }

lib/workers/global/index.js

@@ -64,6 +64,10 @@ async function start() {
       await repositoryWorker.renovateRepository(repoConfig);
     }
     logger.setMeta({});
+    // istanbul ignore if
+    if (global.renovateTimers) {
+      global.renovateTimers.forEach(timer => clearTimeout(timer));
+    }
     logger.info(`${appName} finished`);
   } catch (err) /* istanbul ignore next */ {
     logger.fatal({ err }, `Fatal error: ${err.message}`);