doc: PANTS_IVY_SETTINGS_XML
doc: PANTS_IVY_SETTINGS_XML

This env var can override pants.ini's ivy_settings.

Bugs closed: 656

Reviewed at https://rbcommons.com/s/twitter/r/1609/

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