Don't use avgDelay in interleaved mode

The interleaved mode's single packet set MUST always have 0 delay
for accurate rate.

Before latency code, the interleaved packet set was added implicitly
and had 0 delay. Latency code added explicit packet set and used
avgDelay for the set. The avgDelay was needed for the original algo
used to determine when to send ttag packets. That algo is no longer
used (ttag markers are now explicitly configured by AbstractPort).

Turbo still needs avgDelay for other use, but changes will be made in
Turbo code for that.

server/abstractport.cpp

@@ -715,19 +715,12 @@ int AbstractPort::updatePacketListInterleaved()
         }
     } while ((sec < durSec) || ((sec == durSec) && (nsec < durNsec)));
 
-    // XXX: Ideally, for interleaved mode, we have a single packet set and
-    // the set's delay should be 0.
-    // However, Ttag and Turbo both use the set delay field to derive
-    // the set's avg pps (needed for their own functionality), so we set the
-    // avgDelay here instead of 0.
-    long avgDelay = (lastPktTxSec*long(1e9) + lastPktTxNsec
-                            + (durSec - lastPktTxSec)*long(1e9)
-                            + (durNsec - lastPktTxNsec))
-                       /totalPkts;
-    loopNextPacketSet(totalPkts, 1, 0, avgDelay);
-    qDebug("Interleaved PacketSet of size %lld, duration %llu.%09llu "
-           "repeat 1 and avg delay %ldns",
-            totalPkts, durSec, durNsec, avgDelay);
+    // XXX: For interleaved mode, we ALWAYS have a single packet set with
+    // one repeat and 0n set loop delay
+    loopNextPacketSet(totalPkts, 1, 0, 0);
+    qDebug("Interleaved single PacketSet of size %lld, duration %llu.%09llu "
+           "repeat 1 and delay 0",
+            totalPkts, durSec, durNsec);
 
     // Reset working sched/counts before building the packet list
     sec = nsec = 0;