Remove the ironic-bfv and ironic-ui meeting slots, which have not been used since December 2017 amnd October 2017 respectively. Let's clean up those slots to let someone else take them. Change-Id: I6cebda45ed6d358381e1e90beaddd74cfb6397b1
Change-Id: Ib14c231c6b865bd370145417842d7ee5e3a87d4b