(centos6) tar and lsmod not found

[Mark Street]

Need to add tar and module-init-tools to the list of packages that yum is installing.

[Evan]

I'm looking at this and your other issue. Hopefully, it can all go in the same Dockerfile. At worst, we can just split it into Dockerfile.centos6 and Dockerfile.centos7.

Thanks for using this tooling and it's been a lonely ride ;)