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I've seen trove-setup.service fail in the case that the Trove is behind
a proxy that blocks SSH traffic due to `ssh-keyscan` returning an error.
We only need to scan the SSH host key of UPSTREAM_TROVE if we're going
to be using SSH to acess it, so we can work around this issue.
This pulls in the 'sshknownhosts' Ansible module from commit
80f31fa8a5d3751b4e3e19123164c3ea97f262dd of
<https://github.com/bfmartin/ansible-sshknownhosts>. The module seems
small enough that we don't need to mess with a submodules to include it.
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