[election][kolla] PTL candidacy for Xena

Hi, I'd like to nominate myself to serve as the Kolla PTL for the Xena cycle. I have been PTL for the last 4 cycles, and would like the opportunity to continue to lead the team. Overall I think that the project is moving in the right direction. Some things that I think we should focus on in the next cycle are: * remove our dependency on Dockerhub in CI testing to avoid pull limits * improve the documentation * expand the core team Thanks for reading, Mark Goddard (mgoddard)