cmd/syncthing: Send Ping events to the disk events API #3929
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The Ping event is important, as it means that requests complete within
a sensible time. The disk events API didn't have the Ping event, so
if there were no disk events, the request would keep taking forever.
Unless, of course, there's a reverse proxy which times the request out
after a suitably large interval (or something else aborts it), in which
case Syncthing isn't very happy.
Testing
Ran Syncthing, saw that the request to the disk events API completed with a ping event after a while.