[kolla] Virtual PTG scheduling poll

Hi, Since most of the Kolla team aren't attending the PTG, we've agreed to hold a virtual PTG. We agreed to start with two 4 hour sessions. We can finish early or schedule another session, depending on how we progress. We'll use some video conferencing software TBD. I've created a Doodle poll here [2], please fill it in if you hope to attend. Times are in UTC. Please continue to fill out the planning Etherpad [1]. Thanks, Mark [1] https://etherpad.openstack.org/p/kolla-train-ptg [2] https://doodle.com/poll/adk2smds76d8db4u