metrics: common: Add function to clean environment
metrics: common: Add function to clean environment

This function will try to remove all stopped/running
containers in the environment.

Fixes: #503

Signed-off-by: Mario Alfredo Carrillo Arevalo <962470f5d16f97233f38b7e7baf23f990a7fbec3@intel.com>

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