[docs] Add fuel-agent to getting sources
[docs] Add fuel-agent to getting sources

Closes-bug #1474380

Change-Id: I53eabf678ffe797a15d6f552ba039aa458a581d7

stackforge/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,huntxu/fuel-web,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,SmartInfrastructures/fuel-web-dev,huntxu/fuel-web,stackforge/fuel-web,stackforge/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web