tests: Increase unit test timeout
tests: Increase unit test timeout

Increase unit-test timeout to 10 seconds as 5 seconds is often
not enough in a Jenkins environment.

Allow the timeout to be configured by setting the variable
"CC_GO_TEST_TIMEOUT" to any valid value supported by
"go test -timeout X".

Fixes #617.

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

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