Fixup missed parameter rename.
Fixup missed parameter rename.

https://rbcommons.com/s/twitter/r/871/ comitted @ 50bdab06 failed CI here: https://travis-ci.org/pantsbuild/pants/jobs/32402628
This fixes that.

Testing Done:
$ PANTS_DEV=1 ./pants goal test tests/python/pants_test/scm/::
...
23:16:08 00:00   [test]
23:16:08 00:00     [pytest]
23:16:08 00:00       [run]
                     ============== test session starts ===============
                     platform linux2 -- Python 2.6.9 -- py-1.4.23 -- pytest-2.6.1
                     plugins: cov, timeout
                     collected 4 items

                     tests/python/pants_test/scm/test_git.py ....

                     ============ 4 passed in 0.60 seconds ============

23:16:28 00:20     [junit]
23:16:28 00:20     [specs]
               SUCCESS

Bugs closed: 476

Reviewed at https://rbcommons.com/s/twitter/r/875/

pombredanne/pants,ericzundel/pants,wisechengyi/pants,15Dkatz/pants,areitz/pants,landism/pants,di0spyr0s/pants,ity/pants,fkorotkov/pants,pantsbuild/pants,jtrobec/pants,dbentley/pants,fkorotkov/pants,foursquare/pants,landism/pants,benjyw/pants,landism/pants,pgroudas/pants,laurentgo/pants,foursquare/pants,baroquebobcat/pants,dgomez10/xanon,digwanderlust/pants,dgomez10/xanon,megaserg/pants,tdyas/pants,lahosken/pants,ericzundel/pants,jtrobec/pants,dbentley/pants,ity/pants,15Dkatz/pants,jtrobec/pants,areitz/pants,UnrememberMe/pants,lahosken/pants,megaserg/pants,pgroudas/pants,qma/pants,scode/pants,foursquare/pants,pantsbuild/pants,mateor/pants,landism/pants,mateor/pants,dgomez10/xanon,15Dkatz/pants,tdyas/pants,laurentgo/pants,digwanderlust/pants,TansyArron/pants,kslundberg/pants,scode/pants,areitz/pants,pombredanne/pants,jessrosenfield/pants,pgroudas/pants,peiyuwang/pants,UnrememberMe/pants,cevaris/pants,megaserg/pants,scode/pants,15Dkatz/pants,ericzundel/pants,ity/pants,kslundberg/pants,foursquare/pants,slyphon/pants,baroquebobcat/pants,tdyas/pants,baroquebobcat/pants,pombredanne/pants,dturner-tw/pants,pombredanne/pants,manasapte/pants,pgroudas/pants,baroquebobcat/pants,dturner-tw/pants,jtrobec/pants,tdyas/pants,pantsbuild/pants,dgomez10/xanon,gmalmquist/pants,pantsbuild/pants,sid-kap/pants,baroquebobcat/pants,ity/pants,Gabriel439/pants,TansyArron/pants,kwlzn/pants,qma/pants,15Dkatz/pants,wisechengyi/pants,ericzundel/pants,wisechengyi/pants,dbentley/pants,baroquebobcat/pants,cevaris/pants,laurentgo/pants,twitter/pants,dturner-tw/pants,baroquebobcat/pants,dgomez10/xanon,lahosken/pants,scode/pants,sameerparekh/pants,twitter/pants,laurentgo/pants,sid-kap/pants,laurentgo/pants,fkorotkov/pants,fkorotkov/pants,dturner-tw/pants,dbentley/pants,scode/pants,pombredanne/pants,sameerparekh/pants,slyphon/pants,square/pants,wisechengyi/pants,peiyuwang/pants,15Dkatz/pants,cevaris/pants,di0spyr0s/pants,Gabriel439/pants,square/pants,di0spyr0s/pants,scode/pants,dgomez10/xanon,kwlzn/pants,di0spyr0s/pants,twitter/pants,gmalmquist/pants,mateor/pants,jtrobec/pants,fkorotkov/pants,TansyArron/pants,kwlzn/pants,areitz/pants,dturner-tw/pants,sid-kap/pants,slyphon/pants,benjyw/pants,jsirois/pants,gmalmquist/pants,jessrosenfield/pants,wisechengyi/pants,square/pants,manasapte/pants,digwanderlust/pants,kwlzn/pants,foursquare/pants,manasapte/pants,manasapte/pants,landism/pants,tejal29/pants,Gabriel439/pants,peiyuwang/pants,wisechengyi/pants,jessrosenfield/pants,foursquare/pants,mateor/pants,dturner-tw/pants,twitter/pants,dgomez10/xanon,mateor/pants,qma/pants,UnrememberMe/pants,mateor/pants,slyphon/pants,wisechengyi/pants,dgomez10/xanon,wisechengyi/pants,kwlzn/pants,tdyas/pants,digwanderlust/pants,megaserg/pants,ericzundel/pants,peiyuwang/pants,kslundberg/pants,digwanderlust/pants,tdyas/pants,ity/pants,baroquebobcat/pants,tdyas/pants,dbentley/pants,twitter/pants,landism/pants,15Dkatz/pants,twitter/pants,qma/pants,peiyuwang/pants,jessrosenfield/pants,gmalmquist/pants,jessrosenfield/pants,kslundberg/pants,UnrememberMe/pants,lahosken/pants,mateor/pants,sameerparekh/pants,tejal29/pants,TansyArron/pants,peiyuwang/pants,ity/pants,peiyuwang/pants,peiyuwang/pants,pantsbuild/pants,ericzundel/pants,kwlzn/pants,jsirois/pants,areitz/pants,square/pants,pantsbuild/pants,kslundberg/pants,benjyw/pants,gmalmquist/pants,scode/pants,di0spyr0s/pants,areitz/pants,Gabriel439/pants,cevaris/pants,sid-kap/pants,slyphon/pants,foursquare/pants,pgroudas/pants,ity/pants,sid-kap/pants,slyphon/pants,sameerparekh/pants,UnrememberMe/pants,lahosken/pants,kwlzn/pants,dgomez10/xanon,dbentley/pants,lahosken/pants,TansyArron/pants,jtrobec/pants,tejal29/pants,manasapte/pants,foursquare/pants,di0spyr0s/pants,Gabriel439/pants,benjyw/pants,megaserg/pants,fkorotkov/pants,cevaris/pants,pombredanne/pants,pgroudas/pants,sid-kap/pants,gmalmquist/pants,kslundberg/pants,kslundberg/pants,qma/pants,pombredanne/pants,twitter/pants,fkorotkov/pants,qma/pants,UnrememberMe/pants,qma/pants,digwanderlust/pants,wisechengyi/pants,mateor/pants,tejal29/pants,sameerparekh/pants,jessrosenfield/pants,UnrememberMe/pants,jtrobec/pants,benjyw/pants,manasapte/pants,sameerparekh/pants,lahosken/pants,benjyw/pants,cevaris/pants,sid-kap/pants,megaserg/pants,tdyas/pants,twitter/pants,cevaris/pants,baroquebobcat/pants,Gabriel439/pants,lahosken/pants,jessrosenfield/pants,twitter/pants,slyphon/pants,sameerparekh/pants,TansyArron/pants,UnrememberMe/pants,tejal29/pants,dgomez10/xanon,gmalmquist/pants,di0spyr0s/pants,ericzundel/pants,benjyw/pants,TansyArron/pants,fkorotkov/pants,ericzundel/pants,dturner-tw/pants,areitz/pants,jsirois/pants,foursquare/pants,laurentgo/pants,tdyas/pants,megaserg/pants,UnrememberMe/pants,15Dkatz/pants,landism/pants,dgomez10/xanon,landism/pants,pantsbuild/pants,manasapte/pants,dbentley/pants,Gabriel439/pants