 Use a relocatable pip env for bootstrapping to work around truncation of fully qualified pip script shebangs in deeply nested dirs.
 Use a relocatable pip env for bootstrapping to work around truncation of fully qualified pip script shebangs in deeply nested dirs.

RB_ID=143585

(sapling split of d3025302043f73644b8db07be6efb56f1f353f36)
sameerparekh/pants,pantsbuild/pants,lahosken/pants,digwanderlust/pants,15Dkatz/pants,di0spyr0s/pants,twitter/pants,kwlzn/pants,slyphon/pants,megaserg/pants,mateor/pants,qma/pants,di0spyr0s/pants,sameerparekh/pants,baroquebobcat/pants,TansyArron/pants,ity/pants,gmalmquist/pants,pombredanne/pants,peiyuwang/pants,landism/pants,sid-kap/pants,pgroudas/pants,ericzundel/pants,square/pants,jtrobec/pants,peiyuwang/pants,dgomez10/xanon,lahosken/pants,pombredanne/pants,dgomez10/xanon,TansyArron/pants,qma/pants,kslundberg/pants,pombredanne/pants,areitz/pants,scode/pants,landism/pants,jtrobec/pants,sameerparekh/pants,UnrememberMe/pants,dturner-tw/pants,pantsbuild/pants,ericzundel/pants,tdyas/pants,pombredanne/pants,manasapte/pants,tdyas/pants,ericzundel/pants,scode/pants,qma/pants,fkorotkov/pants,ity/pants,benjyw/pants,di0spyr0s/pants,qma/pants,digwanderlust/pants,wisechengyi/pants,square/pants,15Dkatz/pants,foursquare/pants,jessrosenfield/pants,cevaris/pants,sameerparekh/pants,pantsbuild/pants,baroquebobcat/pants,manasapte/pants,fkorotkov/pants,digwanderlust/pants,UnrememberMe/pants,scode/pants,benjyw/pants,pantsbuild/pants,megaserg/pants,ericzundel/pants,tdyas/pants,megaserg/pants,pantsbuild/pants,slyphon/pants,Gabriel439/pants,baroquebobcat/pants,baroquebobcat/pants,Gabriel439/pants,foursquare/pants,slyphon/pants,gmalmquist/pants,dgomez10/xanon,kwlzn/pants,mateor/pants,slyphon/pants,pgroudas/pants,slyphon/pants,dbentley/pants,dgomez10/xanon,dbentley/pants,15Dkatz/pants,cevaris/pants,twitter/pants,areitz/pants,gmalmquist/pants,dgomez10/xanon,twitter/pants,jtrobec/pants,tdyas/pants,manasapte/pants,dbentley/pants,benjyw/pants,UnrememberMe/pants,wisechengyi/pants,peiyuwang/pants,gmalmquist/pants,wisechengyi/pants,megaserg/pants,tejal29/pants,kslundberg/pants,laurentgo/pants,UnrememberMe/pants,dturner-tw/pants,benjyw/pants,gmalmquist/pants,mateor/pants,ericzundel/pants,lahosken/pants,dgomez10/xanon,landism/pants,scode/pants,tdyas/pants,twitter/pants,ity/pants,kslundberg/pants,dbentley/pants,landism/pants,jtrobec/pants,dgomez10/xanon,foursquare/pants,wisechengyi/pants,baroquebobcat/pants,areitz/pants,gmalmquist/pants,mateor/pants,Gabriel439/pants,pgroudas/pants,Gabriel439/pants,15Dkatz/pants,scode/pants,manasapte/pants,slyphon/pants,dturner-tw/pants,sameerparekh/pants,tdyas/pants,dgomez10/xanon,foursquare/pants,Gabriel439/pants,foursquare/pants,laurentgo/pants,baroquebobcat/pants,laurentgo/pants,mateor/pants,TansyArron/pants,dturner-tw/pants,areitz/pants,manasapte/pants,scode/pants,UnrememberMe/pants,sid-kap/pants,wisechengyi/pants,di0spyr0s/pants,fkorotkov/pants,digwanderlust/pants,sameerparekh/pants,kslundberg/pants,cevaris/pants,pombredanne/pants,lahosken/pants,dgomez10/xanon,benjyw/pants,di0spyr0s/pants,peiyuwang/pants,areitz/pants,jessrosenfield/pants,wisechengyi/pants,megaserg/pants,foursquare/pants,lahosken/pants,pgroudas/pants,kwlzn/pants,Gabriel439/pants,dbentley/pants,ity/pants,wisechengyi/pants,dturner-tw/pants,UnrememberMe/pants,square/pants,foursquare/pants,jessrosenfield/pants,lahosken/pants,slyphon/pants,pantsbuild/pants,fkorotkov/pants,digwanderlust/pants,jessrosenfield/pants,fkorotkov/pants,tdyas/pants,pantsbuild/pants,15Dkatz/pants,lahosken/pants,fkorotkov/pants,mateor/pants,areitz/pants,square/pants,areitz/pants,peiyuwang/pants,baroquebobcat/pants,jessrosenfield/pants,manasapte/pants,kslundberg/pants,foursquare/pants,jessrosenfield/pants,tdyas/pants,TansyArron/pants,twitter/pants,fkorotkov/pants,UnrememberMe/pants,sid-kap/pants,cevaris/pants,15Dkatz/pants,kwlzn/pants,cevaris/pants,dbentley/pants,15Dkatz/pants,di0spyr0s/pants,dturner-tw/pants,pgroudas/pants,sameerparekh/pants,tejal29/pants,twitter/pants,ity/pants,laurentgo/pants,qma/pants,ity/pants,peiyuwang/pants,Gabriel439/pants,mateor/pants,jessrosenfield/pants,di0spyr0s/pants,mateor/pants,pgroudas/pants,gmalmquist/pants,TansyArron/pants,peiyuwang/pants,landism/pants,dbentley/pants,kwlzn/pants,benjyw/pants,ericzundel/pants,tdyas/pants,sid-kap/pants,landism/pants,kwlzn/pants,jtrobec/pants,15Dkatz/pants,qma/pants,jsirois/pants,TansyArron/pants,scode/pants,dgomez10/xanon,pombredanne/pants,jtrobec/pants,kslundberg/pants,twitter/pants,laurentgo/pants,lahosken/pants,peiyuwang/pants,dgomez10/xanon,laurentgo/pants,wisechengyi/pants,tejal29/pants,ericzundel/pants,pombredanne/pants,foursquare/pants,digwanderlust/pants,jsirois/pants,jtrobec/pants,megaserg/pants,fkorotkov/pants,benjyw/pants,twitter/pants,baroquebobcat/pants,dturner-tw/pants,tejal29/pants,ity/pants,baroquebobcat/pants,manasapte/pants,cevaris/pants,wisechengyi/pants,landism/pants,cevaris/pants,megaserg/pants,landism/pants,UnrememberMe/pants,kwlzn/pants,sid-kap/pants,qma/pants,sid-kap/pants,UnrememberMe/pants,jsirois/pants,TansyArron/pants,ericzundel/pants,sid-kap/pants,twitter/pants,kslundberg/pants,tejal29/pants