train-dev: Pass -4 to ssh-keyscan
Pass -4 to the two ssh-keyscan calls so that they only attempt to make
IPv4 connections. if ssh-keyscan is allowed to attempt IPv6
connections, it will fail.
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Pass -4 to the two ssh-keyscan calls so that they only attempt to make
IPv4 connections. if ssh-keyscan is allowed to attempt IPv6
connections, it will fail.