cc-check: Add extra checks
cc-check: Add extra checks

If running as `root`, determine if it is possible to create a new
virtual machine. Special-case the scenario where another hypervisor
is running and explain the problem to the user.

Fixes #848.

Signed-off-by: James O. D. Hunt <348fbaadfbada55ea105602bf5609e23ac1c4898@intel.com>

devimc/runtime,clearcontainers/runtime,devimc/runtime,chavafg/runtime,chavafg/runtime,clearcontainers/runtime