ci: Enable docker for default user
ci: Enable docker for default user

runtime unit tests require docker to be accessible by the
default user.

Fixes #848.

Signed-off-by: Salvador Fuentes <1643e95c8f87731315a493a18f5448396bacc6be@intel.com>

devimc/tests,clearcontainers/tests,chavafg/tests,devimc/tests,clearcontainers/tests,chavafg/tests