Revert "Add cgroup-bin dependency to our Ubuntu package"

This reverts commit c81bb20f5b2b5d86059c6004e60ba23b03d30fe0.

After re-reading the documentation: "The Recommends field should list packages that would be found together with this one in all but unusual installations."

Thus, "Recommends" is an acceptable place for this dep, and anyone disabling that gets to keep the pieces.

The main crux of why this needs to be reverted is because it breaks Debian completely because "lxc" and "cgroup-bin" can't be installed concurrently.
Add debian mirrors. Fixes #3045.
Merge pull request #3086 from metalivedev/3045-addmirrors

Add debian mirrors. Fixes #3045.
Enable engine to take Stderr and Stdout for mocking in tests
devmapper: add missing defines

Add some missing defines which are needed for compiling on older systems
like RHEL 6.
Merge pull request #3085 from tianon/fix-cgroup-dep

Revert "Add cgroup-bin dependency to our Ubuntu package"
Merge pull request #3095 from jpoimboe/missing-defines

devmapper: add missing defines
Merge pull request #3079 from crosbymichael/give-engine-noop-tests

Enable engine to take Stderr and Stdout for mocking in tests