ssh-agent user bug

Because of a bug in the packaging of OpenSSH for Windows, you may run into problems like the following after each feature update:

> ssh-add -l
error fetching identities: communication with agent failed

To fix this, launch an elevated console and create a dummy sshd per the documented workaround:

> New-Service -Name sshd -BinaryPathName C:\Windows\System32\OpenSSH\ssh.exe

Status   Name               DisplayName
------ ----             -----------
Stopped  sshd               sshd