Auto merge of #2674 - alexcrichton:less-third-party-cruft, r=brson
authorbors <bors@rust-lang.org>
Wed, 11 May 2016 23:31:53 +0000 (16:31 -0700)
committerbors <bors@rust-lang.org>
Wed, 11 May 2016 23:31:53 +0000 (16:31 -0700)
Don't print extra error info for subcommands

Assume they take care of error printing, so just ferry along the exit status if
they fail

Closes #2673


Trivial merge