Fix PyAuto crash when a script has multiple tests.

This CL better maps C++ UITestSuite to python suite and C++ UITestBase
to python testcase. All one-time initializations go in the suite while
testcases are re-entrant now -- this is what fixes the crash.

Also:
 - Cmdline flags to pyauto script (verbose, wait for attaching to debugger)
 - Establish the setup of sys.path, so that it's setup correctly and tests
 don't have to worry about it
 - Create facitlites for PYAUTO_TESTS files inside script dirs (say
   chrome/test/functional) which defines the tests to run.
 - Restructure such that pyauto scripts can be run standalone as well as
 using the pyauto.py script (like unittest.py). For example, a test could be
 fired in any of the below ways:

  # Run tests in a module ('bookmarks')
    python pyauto_functional.py bookmarks

  # Run tests in a test case ('bookmarks.BookmarksTest')
   python pyauto_functional.py bookmarks.BookmarksTest

  # Run a test ('bookmarks.BookmarksTest.testBasics')
   python pyauto_functional.py bookmarks.BookmarksTest.testBasics

  # Run directly from the test script
    python bookmarks.py
    python bookmarks.py bookmarks
    python bookmarks.py bookmarks.BookmarksTest
    python bookmarks.py bookmarks.BookmarksTest.testBasics


BUG=32292
TEST=python chrome/test/functional/bookmarks.py

Review URL: http://codereview.chromium.org/1126003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42350 0039d316-1c4b-4281-b951-d872f2087c98

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