Removing unneeded sshconfig

[stevector]

We have other repos that don't need this. @greg-1-anderson have you seen errors when this config isn't present?

[greg-1-anderson]

@stevector Without that configuration, you will sometimes (often) get stuck at a prompt to accept the credentials for the remote server. This only happens when you are running remote Drush or WP-CLI commands. I think this configuration needs to stay.

I'm going to try to re-run the test without the cache, and see if it hangs up. I suspect it only worked this time because Circle ran a previous test with the no host key checking, and cached the credentials.

[greg-1-anderson]

Hm, it said Warning: Permanently added '[appserver.pr-sshconfi.c401fd14-f745-4e51-9af2-f30b45146a0c.drush.in]:2222,[104.130.220.74]:2222' (RSA) to the list of known hosts., which implies that the no host ssh key configuration is active.

[stevector]

@greg-1-anderson, have you ever seen a CircleCI build get hung on a prompt to accept the remote server? Our WordPress plugin and Drupal module repos call Drush and wp-cli commands from CircleCI on Pantheon. But they don't explicitly set StrictHostKeyChecking no

[stevector]

Related to #61

[greg-1-anderson]

Maybe this config line is needed in Travis; CircleCI sets this option in /etc/ssh/ssh_config.