cbq-engine consumes all 11210 connections on Windows

On Windows installs cbq-engine.exe opens and then leaks a new connection to memcached (port 11210) for each query.

Steps to reproduce:

• Simple .NET application (attached) performs queries against a bucket object returned by ClusterHelper.
• Confirm number of open connections from .NET application to 8093:

  C:\Windows\system32>tasklist /V /fo list /FI "PID eq 3980"

  Image Name: ConsoleApplication1.vshost.exe

  PID: 3980

  Session Name: Console

  Session#: 1

  Mem Usage: 40,928 K

  Status: Running

  User Name: COUCHBASE\couchbase

  CPU Time: 0:00:00

  Window Title: file:///C:/Users/couchbase/Documents/Visual Studio 2013/Projects/ConsoleApplication1/ConsoleApplication1/bin/Debug/ConsoleApplication1.EXE

  C:\Windows\system32>netstat -ano | findstr 8093

  TCP 0.0.0.0:8093 0.0.0.0:0 LISTENING 4472

  TCP 0.0.0.0:18093 0.0.0.0:0 LISTENING 4472

  TCP 10.0.2.15:8093 10.0.2.2:49223 ESTABLISHED 4472

  TCP 10.0.2.15:8093 10.0.2.2:65212 ESTABLISHED 4472

  TCP 10.0.2.15:8093 10.0.2.2:65240 ESTABLISHED 4472

  TCP 10.0.2.15:8093 10.0.2.2:65277 ESTABLISHED 4472

  TCP 127.0.0.1:8093 127.0.0.1:52689 ESTABLISHED 4472

  TCP 127.0.0.1:8093 127.0.0.1:56639 ESTABLISHED 4472

  TCP 127.0.0.1:52689 127.0.0.1:8093 ESTABLISHED 2472

  TCP 127.0.0.1:56639 127.0.0.1:8093 ESTABLISHED 3980

  TCP [::]:8093 [::]:0 LISTENING 4472

  TCP [::]:18093 [::]:0 LISTENING 4472

• Confirm open connections between cbq-engine.exe and memcached.exe:

  C:\Windows\system32>tasklist /V /fo list /FI "PID eq 4472"

  Image Name: cbq-engine.exe

  PID: 4472

  Session Name: Services

  Session#: 0

  Mem Usage: 63,548 K

  Status: Unknown

  User Name: NT AUTHORITY\SYSTEM

  CPU Time: 0:00:49

  Window Title: N/A

  C:\Windows\system32>netstat -ano | findstr 11210

  ...

  TCP 127.0.0.1:60124 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60125 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60126 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60127 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60128 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60129 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60130 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60131 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60132 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60133 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60134 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60135 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60136 127.0.0.1:11210 ESTABLISHED 4472

  TCP 127.0.0.1:60137 127.0.0.1:11210 ESTABLISHED 4472

  ...

• Check output of cbstats:

  curr_conns_on_port_11210: 8223

  max_conns_on_port_11210: 30000