Rename SingleLineReformatterTest since it's no longer for single lines only
Rename SingleLineReformatterTest since it's no longer for single lines only

lucius-feng/yapf,google/yapf,sbc100/yapf,google/yapf,elviswf/yapf,dmoliveira/yapf,ambv/yapf,sbc100/yapf,nikolamilosevic86/yapf,jamesblunt/yapf,wklken/yapf,abduld/yapf,bygloam/yapf,hayd/yapf,thurday/yapf