Add simple error logs in result DB
Add simple error logs in result DB

Used afterwards for the reporting to identify quickly
which case(s) are failing

Change-Id: I0030c69000ec36e42f7791630639fce5bc4b0f1e
Signed-off-by: Morgan Richomme <863ecccd07b4194c40ddc432b982c8c67e56599a@orange.com>

mywulin/functest,opnfv/functest,opnfv/functest,mywulin/functest