[cinder] xena R-18 virtual mid-cycle on 2 june

As mentioned at today's weekly meeting, the Cinder Xena R-18 virtual mid-cycle will be held: DATE: Wednesday 2 June 2021 TIME: 1400-1600 UTC LOCATION: https://bluejeans.com/3228528973 The meeting will be recorded. Please add topics to the mid-cycle etherpad: https://etherpad.opendev.org/p/cinder-xena-mid-cycles cheers, brian