Install opam deps in build-infer script
Install opam deps in build-infer script

Summary:
build-infer.sh script will create separate switch infer-4.02.3 and install all infer's deps there (including reason)
With this change users won't have to run opam install commands directly

Reviewed By: jvillard

Differential Revision: D3508897

fbshipit-source-id: 9f8e741

jvillard/infer,ryoon/infer,jvillard/infer,ropas/infer,ropas/infer,kageiit/infer,xennygrimmato/infer,jsachs/infer,ropas/infer,xennygrimmato/infer,ryoon/infer,facebook/infer,xennygrimmato/infer,jvillard/infer,ropas/infer,blzq/infer,facebook/infer,ryoon/infer,blzq/infer,xennygrimmato/infer,blzq/infer,facebook/infer,facebook/infer,jsachs/infer,kageiit/infer,kageiit/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,jsachs/infer,blzq/infer,ropas/infer,jsachs/infer,kageiit/infer,xennygrimmato/infer,xennygrimmato/infer,jsachs/infer,kageiit/infer,kageiit/infer,kageiit/infer,facebook/infer,blzq/infer,jvillard/infer,facebook/infer,xennygrimmato/infer,ryoon/infer,ropas/infer,jsachs/infer,ryoon/infer,ryoon/infer,blzq/infer