ssh hang when remote reboot

[ChiWu-Zero]

Overview of the Issue

the code will hang on func newSession() in communicator/ssh/communicator.go
sometimes when rebooting remote server.

Reproduction Steps

1. the provisioner config is as follow and the reboot.sh will reboot the remote system.

"provisioners": [ { "type": "shell", "scripts": [ "reboot.sh" ], "expect_disconnect": true }, ..... ]

2. when rebootting the remote system, the the packer will hang on newSession()
   sometimes.

Packer Plugin SDK version

v0.2.11

Operating system and Environment details

it's a copy of golang/go#50604
and after view the the issue golang/go#26643
maybe we deal with the problem on sdk level.

Log Fragments and crash.log files

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please include the URL to the gist of the log or
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