client: add GetHostUser for u@host and .ssh/config #280
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Since 2017 cpu used $USER as the user. Now that it supports ssh, it needs better processing.
Add GetHostUser, which takes a string in [user@]host form, and returns a host and user name as follows:
if user@host form, return the host and user.
Look up the host in .ssh/config; if found, and
there is a UserName record, return that UserName
Otherwise return host and $USER.
If a host entry is found in .ssh/config, the
HostName from that entry is used.
This means that code that used GetHost should start using GetHostUser.