SSH modules writing to ~/.ssh/known_hosts

[wvu]

This has been annoying me for quite some time.

1. Run an SSH module
2. See that it wrote to ~/.ssh/known_hosts
3. Get angry because you just used a scanner

Note that the cargo-culted SSH options hash we use already disables config and agent.

[h00die]

I'll also add that if you are testing multiple networks on an engagement with overlapping IP ranges, you will get a silent failure for ssh_login if there is a server ssh key mismatch. That's always annoyed the hell out of me.

[kkirsche]

Patch submitted @wvu-r7

[wvu]

Hooray!