Add sleep and retry to service-list check
Add sleep and retry to service-list check

Retry service-list check in order to avoid highload
services synchronization issues

Change-Id: I7d06ac3cf22bb3a844f76c2d445876d192dd7d66

AnselZhangGit/fuel-main,eayunstack/fuel-main,Fiware/ops.Fuel-main-dev,zhaochao/fuel-main,SergK/fuel-main,huntxu/fuel-main,stackforge/fuel-main,SmartInfrastructures/fuel-main-dev,ddepaoli3/fuel-main-dev,dancn/fuel-main-dev,Fiware/ops.Fuel-main-dev,dancn/fuel-main-dev,AnselZhangGit/fuel-main,ddepaoli3/fuel-main-dev,dancn/fuel-main-dev,teselkin/fuel-main,dancn/fuel-main-dev,zhaochao/fuel-main,SmartInfrastructures/fuel-main-dev,huntxu/fuel-main,SmartInfrastructures/fuel-main-dev,stackforge/fuel-main,teselkin/fuel-main,Fiware/ops.Fuel-main-dev,huntxu/fuel-main,AnselZhangGit/fuel-main,SmartInfrastructures/fuel-main-dev,ddepaoli3/fuel-main-dev,teselkin/fuel-main,zhaochao/fuel-main,SergK/fuel-main,eayunstack/fuel-main,Fiware/ops.Fuel-main-dev,ddepaoli3/fuel-main-dev,zhaochao/fuel-main,stackforge/fuel-main,teselkin/fuel-main,SergK/fuel-main,eayunstack/fuel-main,AnselZhangGit/fuel-main,zhaochao/fuel-main