Add timing for propfind, and for ops which exceed time allotment, to send to graphite

Also lowers the threshold at which dynamic logging kicks in so that the log-to-journal header can be sent to valhalla when it is useful for valhalla to log messages and not only when it is already too late. When fusedav recognizes a single node being sad, as opposed to waiting for all 3 to be sad, it will kick dynamic debugging in. This will increase the chances that when valhalla needs investigating, there will be extra logging to help out. More work still to do on valhalla to have the right log messages emitted.