Make the "pub" and "pkg" test suites run Dart from the built SDK.
Make the "pub" and "pkg" test suites run Dart from the built SDK.

I'm not using a test.dart command-line argument for this because
I want to enforce that they *always* run out of the built SDK
directory. This will be needed in a later patch so that the pub
test code can find the SDK directory easily relative to the
currently running Dart executable.

Review URL: https://codereview.chromium.org//11777003

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@16652 260f80e4-7a28-3924-810f-c04153c831b5

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