Add stateful partition reset to upgrade process.

The --stateful_change=clean flag is working again for stateful updates. By adding the flag to our upgrade process we ensure that we're always working with a clean base for testing. No more out of space issues due to lingering core dumps or other files.

Change-Id: Iee205df9964bef49f47422b13d2adcf1f38a9dd4

BUG=chromium-os:11971
TEST=Tested flag manually on ToT public, ToT mario, RC mario, and RC agz. Will test code in production.

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=85ce69e

Review URL: http://codereview.chromium.org/6021006
1 file changed