As we move forward with zuulv3, we no longer need to ability to SSH
into a node from nodepool-launcher. This means we can remove SSH
private keys from production server. Now we only keyscan the node and
pass the info to zuul to do SSH operations.
We also create out own socket now for paramiko, so we can better
control the exception handling.
Change-Id: I123631aa41fd3db374ef78cf97a8b8afde93f699
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
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