pmctl watchdog tests

For https://github.com/strongloop-internal/scrum-nodeops/issues/219

Add some tests.
The  particular lines above look weird on screen, agreed, but its those in particular. I didn't change them, because as soon as you remove the config option, the "with new config" phrase goes away, removing the problem. With this in-line paragraph style, though, I completely agree, the brief description must fit on a single line, and any continuation must happen in the paragraph below.

The man-page style is what I attempted with slc, it seemed good in theory, but in practice the formatting by marked was terrible, the tools are cumbersome, and I don't think it was a success.

That's more a critique of the toolset I found than the approach, but I tried to clone npm's way of doing this, and it didn't work very well. I suspect git uses groff, a professional grade type setter, but I'm not sure its the right way for a node project.