Add completion event to pcapper SNAPSHOT so that the caller (say, loghole)
knows when the logfiles are actually rolled. Event groups complicated things a bit. To make this work properly, we no longer subscribe to the link-tracemon event, but instead use a real event group, created by assign wrapper for all of the linktrace agents. So, you can know do things like this: tevc -w -e testbed/TT now link0_tracemon snapshot or tevc -w -e testbed/TT now __all_tracemon snapshot where __all_tracemon is a group of all tracemon agents for all links and lans. I plan to change loghole to use this.
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