Document how cgroups are done today and what is expected
for the upcoming SandboxCgroupOnly option.
Prior cgroup documentation are no longer accurate. Removing the cgroup
discussion from the cpu sizing discussion. Updating the
cpu-constraints.md file name to reflect this.
Fixes: #542
Signed-off-by: Eric Ernst <eric.ernst@intel.com>
Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>
