Add blurb on monitoring other suites.

Add a bit of text to the section on monitoring suites to outline how to do this currently without SSH access.

I've opened a pull request if you're interested in this - I think the changes in #529 help a lot as well, but this makes it slightly more explicit.

If you do want to include this, we'd need to make it so the path listing doesn't run off the edge of the page (my LaTeX is rusty) and may be put in a warning echoing what's in the new section about what having the passphrase and port means for being able to control the suite (of course, maybe this is what some people want - "I'm on vacation - can you kill my suite for me?")