Auto merge of #3869 - matklad:test-isolation, r=alexcrichton
authorbors <bors@rust-lang.org>
Mon, 27 Mar 2017 13:51:57 +0000 (13:51 +0000)
committerbors <bors@rust-lang.org>
Mon, 27 Mar 2017 13:51:57 +0000 (13:51 +0000)
Don't read ~/.cargo/config in tests

Closes #3863

r? @alexcrichton


Trivial merge