Support verbose logging

The previous verbose logging switch '-v' doesn't work as we expected.
Change the code to follow python conventions to make it work.

Issue-ID: VNFSDK-297
Change-Id: Ia0c41b5067d9c28acccabc4137797310052fce5e
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
5 files changed