Verify downloads in static Dockerfiles

[aahlenst]

#1925 introduced Dockerfiles in ansible/playbooks/AdoptOpenJDK_Unix_Playbook/roles/DockerStatic/Dockerfiles/ that download a couple of things (ant, ant-contrib). We should check their checksums after downloading.

[jeffalder]

@sxa I'm going to grab this as well; I've got a PR ready.