node: rmv tls-sessions

reached ~2mb in size in test runs at 1000 queries per sec for 20 secs, and
no resumptions actually happened. With TLS tickets now valid for 7d, there
is really no need to also support the almost obsolete session resumption.

src/server-node.js

@@ -46,8 +46,6 @@ class Stats {
   constructor() {
     this.noreqs = -1;
     this.nofchecks = 0;
-    this.fasttls = 0;
-    this.totfasttls = 0;
     this.tlserr = 0;
     this.nofdrops = 0;
     this.nofconns = 0;
@@ -59,10 +57,10 @@ class Stats {
   str() {
     return (
       `reqs=${this.noreqs} checks=${this.nofchecks} ` +
-      `drops=${this.nofdrops}/tot=${this.nofconns}/t=${this.noftimeouts} ` +
+      `drops=${this.nofdrops}/tot=${this.nofconns} ` +
+      `timeouts=${this.noftimeouts}/tlserr=${this.tlserr} ` +
       `n=${this.bp[4]}/adj=${this.bp[3]} ` +
-      `load=${this.bp[0]}/${this.bp[1]}/${this.bp[2]} ` +
-      `fasttls=${this.fasttls}/${this.totfasttls} tlserr=${this.tlserr}`
+      `load=${this.bp[0]}/${this.bp[1]}/${this.bp[2]}`
     );
   }
 }
@@ -169,7 +167,6 @@ class Tracker {
 const zero6 = "::";
 const tracker = new Tracker();
 const stats = new Stats();
-const tlsSessions = new LfuCache("tlsSessions", 10000);
 const cpucount = os.cpus().length || 1;
 const adjPeriodSec = 5;
 let adjTimer = null;
@@ -442,22 +439,6 @@ function trapSecureServerEvents(s) {
   const rottm = util.repeat(86400000 * 7, () => rotateTkt(s)); // 7d
   rottm.unref();
 
-  s.on("newSession", (id, data, next) => {
-    const hid = bufutil.hex(id);
-    tlsSessions.put(hid, data);
-    log.d("tls: new session;", hid);
-    next();
-  });
-
-  s.on("resumeSession", (id, next) => {
-    const hid = bufutil.hex(id);
-    const data = tlsSessions.get(hid) || null;
-    log.d("tls: resume session;", hid, "ok?", data != null);
-    if (data) stats.fasttls += 1;
-    else stats.totfasttls += 1;
-    next(/* err*/ null, data);
-  });
-
   s.on("error", (err) => {
     log.e("tls: stop! server error; " + err.message, err);
     stopAfter(0);