fix sleep only on repeat of server list during reconnect

[scottf]

This code in connection does the reconnect delayon every round except the very first because srvPool.First() is always the first thing in the pool and srvPool.SelectNextServer does not advance the pool, so line 7 is always true. (Lines 10 and 16 were added to demonstrate, not part of original code.)

01: Srv cur;
02: int wlf = 0;
03: bool doSleep = false;
04: while ((cur = srvPool.SelectNextServer(Opts.MaxReconnect)) != null)
05: {
06:     // check if we've been through the list
07:     if (cur == srvPool.First())
08:     {
09:         doSleep = (wlf != 0);
10:         Console.WriteLine("== wlf: " + wlf + ", doSleep: " + doSleep + ", cur: " + cur.Url + " == " + srvProvider.First().Url);
11:         wlf++;
12:     }
13:     else
14:     {
15:         doSleep = false;
16:         Console.WriteLine("!= wlf: " + wlf + ", doSleep: " + doSleep + ", cur: " + cur.Url + " != " + srvProvider.First().Url);
17:     }

The output is this.

== wlf: 0, doSleep: False, cur: nats://localhost:11498/ == nats://localhost:11498/
== wlf: 1, doSleep: True, cur: nats://localhost:11497/ == nats://localhost:11497/
== wlf: 2, doSleep: True, cur: nats://localhost:11498/ == nats://localhost:11498/
== wlf: 3, doSleep: True, cur: nats://localhost:11497/ == nats://localhost:11497/
== wlf: 4, doSleep: True, cur: nats://localhost:11498/ == nats://localhost:11498/
== wlf: 5, doSleep: True, cur: nats://localhost:11497/ == nats://localhost:11497/
== wlf: 6, doSleep: True, cur: nats://localhost:11498/ == nats://localhost:11498/
== wlf: 7, doSleep: True, cur: nats://localhost:11497/ == nats://localhost:11497/