CLN: Made Excel file instance variable name consistent across all 3 test_parse_cols*() unit tests.
CLN: Made Excel file instance variable name consistent across all 3
test_parse_cols*() unit tests.

TomAugspurger/pandas,MJuddBooth/pandas,kdebrab/pandas,rs2/pandas,pandas-dev/pandas,DGrady/pandas,kdebrab/pandas,GuessWhoSamFoo/pandas,winklerand/pandas,MJuddBooth/pandas,jmmease/pandas,jmmease/pandas,harisbal/pandas,jorisvandenbossche/pandas,cbertinato/pandas,toobaz/pandas,toobaz/pandas,dsm054/pandas,dsm054/pandas,Winand/pandas,jreback/pandas,rs2/pandas,toobaz/pandas,cbertinato/pandas,linebp/pandas,louispotok/pandas,linebp/pandas,jmmease/pandas,cython-testbed/pandas,DGrady/pandas,cbertinato/pandas,kdebrab/pandas,toobaz/pandas,pratapvardhan/pandas,winklerand/pandas,DGrady/pandas,MJuddBooth/pandas,jmmease/pandas,Winand/pandas,jmmease/pandas,jorisvandenbossche/pandas,linebp/pandas,jreback/pandas,cython-testbed/pandas,Winand/pandas,louispotok/pandas,datapythonista/pandas,kdebrab/pandas,GuessWhoSamFoo/pandas,pratapvardhan/pandas,pratapvardhan/pandas,jreback/pandas,GuessWhoSamFoo/pandas,zfrenchee/pandas,TomAugspurger/pandas,linebp/pandas,cython-testbed/pandas,zfrenchee/pandas,harisbal/pandas,DGrady/pandas,cbertinato/pandas,gfyoung/pandas,datapythonista/pandas,toobaz/pandas,kdebrab/pandas,dsm054/pandas,amolkahat/pandas,pandas-dev/pandas,nmartensen/pandas,gfyoung/pandas,linebp/pandas,gfyoung/pandas,datapythonista/pandas,pandas-dev/pandas,nmartensen/pandas,zfrenchee/pandas,pratapvardhan/pandas,TomAugspurger/pandas,winklerand/pandas,louispotok/pandas,jorisvandenbossche/pandas,GuessWhoSamFoo/pandas,cython-testbed/pandas,DGrady/pandas,MJuddBooth/pandas,amolkahat/pandas,Winand/pandas,GuessWhoSamFoo/pandas,nmartensen/pandas,amolkahat/pandas,nmartensen/pandas,linebp/pandas,zfrenchee/pandas,harisbal/pandas,jreback/pandas,gfyoung/pandas,DGrady/pandas,pandas-dev/pandas,jreback/pandas,jmmease/pandas,nmartensen/pandas,louispotok/pandas,pratapvardhan/pandas,cython-testbed/pandas,harisbal/pandas,Winand/pandas,gfyoung/pandas,MJuddBooth/pandas,louispotok/pandas,TomAugspurger/pandas,rs2/pandas,winklerand/pandas,harisbal/pandas,amolkahat/pandas,winklerand/pandas,cbertinato/pandas,Winand/pandas,zfrenchee/pandas,dsm054/pandas,jorisvandenbossche/pandas,amolkahat/pandas,winklerand/pandas,dsm054/pandas,nmartensen/pandas,datapythonista/pandas,rs2/pandas