metrics: add reporting to network-metrics.sh
metrics: add reporting to network-metrics.sh

Implement results reporting to network-metrics.sh by calling
save_results(). Also reworking data gathering to eliminate multiple
subshells.

Signed-off-by: Brett T. Warden <3c49f16b9d4a3f688e955241c679cb8951e4845a@intel.com>

chavafg/tests,devimc/tests,bwarden/tests,sboeuf/tests,clearcontainers/tests,devimc/tests,clearcontainers/tests,bwarden/tests,chavafg/tests,MarioCarrilloA/tests,sboeuf/tests,MarioCarrilloA/tests