Change clobbering to use the new script inside the dart tools directory.

Change clobbering to use the new script inside the dart tools directory.

This is the first step in unifying our clobbering functionality, I will change the vm and dartc bots to use this in another cl (the current scripts reside in another repository).

Also, I will do another follow up for browser bot clobbering later, including changing the current wrong clobber for windows 7 bots (which uses the old naming scheme for output directories)
Committed: https://code.google.com/p/dart/source/detail?r=10644

[ricow1, 2012-08-14 13:13:37]

Adding mads, peter is gone

[Mads Ager (google), 2012-08-14 13:18:00]

LGTM

[ahe, 2012-08-14 17:57:20]

LGTM

Thank you for cleaning this up, Rico!

Cheers,
Peter

https://chromiumcodereview.appspot.com/10826301/diff/1/utils/compiler/buildbo...
File utils/compiler/buildbot.py (right):

https://chromiumcodereview.appspot.com/10826301/diff/1/utils/compiler/buildbo...
utils/compiler/buildbot.py:308: if os.environ.get(BUILDER_CLOBBER) == "1":
return os.environ.get(BUILDER_CLOBBER) == "1"