The diskimage-builder meeting has not been happening since
November, 2017.
Let's clean up the slot to let someone else take it.
Change-Id: I5d9a8c2199074d5d1b9e773af0fbdaba6fb78b1f
The meeting has not been happening, but I'd like to restart it. This
will move it to next week. I also added myself as the chair.
Change-Id: Ia16f8861c37a09e16b776432717c182afef292c7