Define one logger per key module
Define one logger per key module

Snaps is printing lots of error messages which makes user confused.
It will decrease the size of functest.log.

Change-Id: I2c7d8ec968350563fbfbd62dcc2fc39b13b39a78
Signed-off-by: Cédric Ollivier <a8c09dc6bf3f3238e291ca80554cc97239f1a234@gmail.com>

opnfv/functest,opnfv/functest