revert one change from prev checkin as it impacted testing

lib/fs-tracking.js

@@ -49,6 +49,15 @@ module.exports = (srf, logger) => {
     }
   });
 
+  if (process.env.JAMBONES_FEATURE_SERVERS) {
+    dynamic = false;
+    process.env.JAMBONES_FEATURE_SERVERS
+      .split(',')
+      .map((hp) => hp.trim())
+      .forEach((uri) => contacts.set(uri, {active: 0, calls: 0}));
+    debug(`using static list of feature servers: ${[ ...contacts]}`);
+  }
+
   if (dynamic) {
     const CHECK_INTERVAL = 35;
     setInterval(() => {