[buck] change order of the commands passed to buck, make sure user provided ones are last (and overrides the others)
[buck] change order of the commands passed to buck, make sure user provided ones are last (and overrides the others)

Summary: When we have clashing args to bug (for instance -j and -Xbuck --num-threads) CLI passed -Xbuck args should win.

Reviewed By: jvillard

Differential Revision: D20557060

fbshipit-source-id: 726fc501a

facebook/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer