[cli] do not export the contents of .inferconfig to INFER_ARGS
[cli] do not export the contents of .inferconfig to INFER_ARGS

Summary:
Propagating the arguments read in .inferconfig shouldn't be necessary as they
are parsed by each executable. There are corner cases where I think this diff
could change the behaviour of infer (eg, .inferconfig redefines project-root
and subsequent exes read a different .inferconfig thanks to the project-root in
INFER_ARGS), but I don't think there are good use cases like that.

Reviewed By: jberdine

Differential Revision: D4475092

fbshipit-source-id: 5c020d0

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