The weekly IRC meeting has not been active for several months now.
Cancel it and keep only the biweekly one.
Also update list of active chairs.
Change-Id: I33ddccb087ce8df55a62021f3b0cc1a4f78595e3
The current meeting at 0900 UTC is in the middle of the night for the
Americas. To foster more contributions, I am proposing to hold a meeting
every other week on Thursday at 1600 UTC, starting from the week after
the Denver Summit and PTG.
Also update chair list to match currently active core reviewers.
Change-Id: I0dfbf5bad5a011e085156e3a6846f16f5be936a0