Use _.uniqueId to generate random names for UI func tests
Use _.uniqueId to generate random names for UI func tests

Currentry Math.random() is used, which results in rare
collisions like this one:

https://ci.fuel-infra.org/job/verify-fuel-web-ui/7047/

Change-Id: I5f3283950cc3e8b430235af50baecec794ad305e

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