V8 buildbot: change sample to d8 from shell.
V8 buildbot: change sample to d8 from shell.

The tools/test.py script is being updated to use D8 instead of shell
(which we will strip down to what it was intentionally meant to be)
Review URL: http://codereview.chromium.org/7218071

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@94045 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build