Adding self to various maintainers files.

Obviously will need to wait to be merged til Solomon is back.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
OK, you will be representing systemd on Debian? If so LGTM.

Aside: It would be nice if there was a better way of notifying people of changes in subsystems besides adding them to MAINTAINERS. In the Linux Kernel they have mailing lists for different parts of the system. I have no idea how we would replicate that with GitHub.