provisioner/shell: close source script file handle
provisioner/shell: close source script file handle

smerrill/packer,suma/packer,zyegfryed/packer,patricklucas/packer,Kaixiang/packer,patricklucas/packer,suma/packer,TranscendComputing/packer,patricklucas/packer,zyegfryed/packer,TranscendComputing/packer,Kaixiang/packer,zyegfryed/packer,suma/packer,Kaixiang/packer,smerrill/packer,smerrill/packer,TranscendComputing/packer,TranscendComputing/packer,Kaixiang/packer,zyegfryed/packer,patricklucas/packer,smerrill/packer,suma/packer