[Docker-maint] docker-containerd is marked for autoremoval from testing

[Debian testing autoremoval watch]

docker-containerd 0.2.3+git+docker1.13.1~ds1-1 is marked for autoremoval from testing on 2018-03-27

It (build-)depends on packages with these RC bugs:
890107: docker-runc: docker-runc FTBFS on s390x: kill.go:42:20: error: reference to undefined identifier 'syscall.SIGUNUSED'