Docker network connect cli has problem connecting a container with portmapping

[coolljt0725]

When a container has port mappings, it will failed to connect to other network.
Step to reproduce:

$ docker run -d --name test1  -p 5000:5000 busybox top
a2119164c5bee543d7c3cc4e128826290d114c18095dbf268b2014835b625f6b
$ docker network connect test test1
Error response from daemon: failed to create endpoint test1 on network test: Bind for 0.0.0.0:5000 failed: port is already allocated
$

docker version
Client:
Version: 1.10.0-dev
API version: 1.22
Go version: go1.4.2
Git commit: e357be4
Built: Mon Nov 9 12:25:37 UTC 2015
OS/Arch: linux/amd64

Server:
Version: 1.10.0-dev
API version: 1.22
Go version: go1.4.2
Git commit: e357be4
Built: Mon Nov 9 12:25:37 UTC 2015
OS/Arch: linux/amd64

[GordonTheTurtle]

Hi!

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[mavenugo]

ping @sanimej