Fix an issue where ivy-bootstrap is ignoring http proxy setttings
Fix an issue where ivy-bootstrap is ignoring http proxy setttings

Ran a pants build in AWS and it failed on ivy-boostrap even with all the right https/http proxy settings, essentially the same issue mentioned by someone here

https://groups.google.com/forum/#!searchin/pants-devel/ivy$20failed/pants-devel/5XTt_sWRSbM/SxIKArR-BgAJ

It turns out boostrap ivy is not pulling in extra_jvm_options.

Testing Done:
https://github.com/pantsbuild/pants/pull/2990
seems like CI flakness?

Reviewed at https://rbcommons.com/s/twitter/r/3522/

baroquebobcat/pants,twitter/pants,15Dkatz/pants,pantsbuild/pants,gmalmquist/pants,landism/pants,peiyuwang/pants,fkorotkov/pants,peiyuwang/pants,benjyw/pants,ity/pants,ericzundel/pants,baroquebobcat/pants,cevaris/pants,wisechengyi/pants,ericzundel/pants,dbentley/pants,pantsbuild/pants,mateor/pants,lahosken/pants,tdyas/pants,baroquebobcat/pants,wisechengyi/pants,twitter/pants,lahosken/pants,pantsbuild/pants,lahosken/pants,fkorotkov/pants,fkorotkov/pants,gmalmquist/pants,dbentley/pants,pombredanne/pants,ity/pants,landism/pants,benjyw/pants,mateor/pants,fkorotkov/pants,tdyas/pants,baroquebobcat/pants,ericzundel/pants,landism/pants,pantsbuild/pants,tdyas/pants,fkorotkov/pants,pombredanne/pants,15Dkatz/pants,ericzundel/pants,dbentley/pants,twitter/pants,foursquare/pants,tdyas/pants,mateor/pants,cevaris/pants,15Dkatz/pants,pombredanne/pants,dbentley/pants,UnrememberMe/pants,landism/pants,baroquebobcat/pants,dbentley/pants,pombredanne/pants,UnrememberMe/pants,tdyas/pants,kwlzn/pants,ity/pants,foursquare/pants,tdyas/pants,ericzundel/pants,foursquare/pants,cevaris/pants,cevaris/pants,ity/pants,lahosken/pants,landism/pants,manasapte/pants,baroquebobcat/pants,pantsbuild/pants,mateor/pants,gmalmquist/pants,mateor/pants,peiyuwang/pants,manasapte/pants,foursquare/pants,foursquare/pants,peiyuwang/pants,fkorotkov/pants,wisechengyi/pants,landism/pants,benjyw/pants,UnrememberMe/pants,kwlzn/pants,benjyw/pants,dbentley/pants,15Dkatz/pants,lahosken/pants,tdyas/pants,lahosken/pants,peiyuwang/pants,cevaris/pants,gmalmquist/pants,foursquare/pants,manasapte/pants,twitter/pants,ericzundel/pants,benjyw/pants,kwlzn/pants,ity/pants,lahosken/pants,fkorotkov/pants,pombredanne/pants,peiyuwang/pants,mateor/pants,manasapte/pants,ity/pants,gmalmquist/pants,benjyw/pants,cevaris/pants,pantsbuild/pants,mateor/pants,manasapte/pants,wisechengyi/pants,cevaris/pants,baroquebobcat/pants,jsirois/pants,foursquare/pants,wisechengyi/pants,wisechengyi/pants,dbentley/pants,ericzundel/pants,ericzundel/pants,tdyas/pants,foursquare/pants,15Dkatz/pants,landism/pants,benjyw/pants,mateor/pants,pantsbuild/pants,UnrememberMe/pants,ity/pants,tdyas/pants,UnrememberMe/pants,jsirois/pants,baroquebobcat/pants,kwlzn/pants,lahosken/pants,UnrememberMe/pants,twitter/pants,15Dkatz/pants,UnrememberMe/pants,UnrememberMe/pants,15Dkatz/pants,twitter/pants,landism/pants,kwlzn/pants,twitter/pants,peiyuwang/pants,foursquare/pants,15Dkatz/pants,twitter/pants,twitter/pants,gmalmquist/pants,kwlzn/pants,wisechengyi/pants,manasapte/pants,wisechengyi/pants,baroquebobcat/pants,pombredanne/pants,manasapte/pants,kwlzn/pants,UnrememberMe/pants,wisechengyi/pants,peiyuwang/pants,fkorotkov/pants,pombredanne/pants,gmalmquist/pants,jsirois/pants