cc-check/tests: Switch to using assert object.
cc-check/tests: Switch to using assert object.

Create a separate assert object for all tests to avoid having to pass
the testing.T object on every call.

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

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