Fix flake8 errors in query_db script
Fix flake8 errors in query_db script

Change-Id: I1f1256ff39b68e0c9b66ed99e22f1e48fa4de08b

huntxu/fuel-library,eayunstack/fuel-library,stackforge/fuel-library,ddepaoli3/fuel-library-dev,ddepaoli3/fuel-library-dev,SmartInfrastructures/fuel-library-dev,eayunstack/fuel-library,zhaochao/fuel-library,xarses/fuel-library,SmartInfrastructures/fuel-library-dev,xarses/fuel-library,eayunstack/fuel-library,stackforge/fuel-library,stackforge/fuel-library,ddepaoli3/fuel-library-dev,zhaochao/fuel-library,SmartInfrastructures/fuel-library-dev,stackforge/fuel-library,zhaochao/fuel-library,zhaochao/fuel-library,huntxu/fuel-library,xarses/fuel-library,eayunstack/fuel-library,huntxu/fuel-library,SmartInfrastructures/fuel-library-dev,ddepaoli3/fuel-library-dev,huntxu/fuel-library,ddepaoli3/fuel-library-dev,xarses/fuel-library,huntxu/fuel-library,zhaochao/fuel-library,SmartInfrastructures/fuel-library-dev,eayunstack/fuel-library