refactored SLClientFake to FakeSLClient for consistency
refactored SLClientFake to FakeSLClient for consistency

jianqiu/softlayer-go,eirslett/softlayer-go,maximilien/softlayer-go,TheWeatherCompany/softlayer-go,mattcui/softlayer-go,eirslett/softlayer-go,jianqiu/softlayer-go,mattcui/softlayer-go,TheWeatherCompany/softlayer-go,maximilien/softlayer-go