Unix ntp collector

Collect various ntp status so we can alert on functioning ntp.
I think we should change pretty much all of those other uses of regexes and remove them. It's more obvious what's going on with a parser. Regexs are too hard to read. This one is short but still takes a minute or two to convince yourself what it's doing. The longer ones we have are worse.

For examples of collectors that don't use regexs, grep for "strings", which will find uses of that package. There are over 100 such uses of the string package to split, examine, and modify text-based data.