[PATCH] Add remote testing support to the lit config.

[Jonathan Roelofs]

Hi danalbert, EricWF,

This doesn't claim to support ShTest tests yet, but I've added in a hacked-together wrapper script `remoteRun.py` as one possible solution. I'm still not certain how to orchestrate executable copy-in for those cases.

Here I've also punted on what to do about test data files. The affected tests are:
    libc++ :: std/input.output/file.streams/fstreams/filebuf.virtuals/pbackfail.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.assign/member_swap.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.assign/move_assign.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.assign/nonmember_swap.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.cons/move.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.cons/pointer.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.cons/string.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.members/close.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.members/open_pointer.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.members/open_string.pass.cpp
    libc++ :: std/input.output/file.streams/fstreams/ifstream.members/rdbuf.pass.cpp
    libc++ :: std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
    libc++ :: std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp

I tested this on my mac with an SSHExecutor that connects to localhost, and copies executables into /tmp to get a feel for the overhead. That run took ~414s, whereas a normal one takes about half that at ~204s.

This isn't quite ready for commit, but it's a lot closer... There's still a few things I'd like to pick your brains on, @danalbert and @EricWF.

http://reviews.llvm.org/D7380

Files:
  libcxx/test/config.py
  libcxx/test/format.py
  libcxx/test/remote.py
  lit.site.cfg.in
  remoteRun.py

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