crosutils: let factory test uses its own results folder

crosutils: let factory test uses its own results folder

The factory tests should not use default results folder, otherwise a developer
running autotests by command line would corrupt the whole factory test
framework.

Since tools/autotest cannot support additional parameters and our state (to
continue) is clear, the command is also changed to directly invoke bin/autotest.

BUG=chrome-os-partner:2378
TEST=manually patched into a factory test device and verified factory
     UI works at new boot and a reboot.

Change-Id: I9f6ef31114bdda740319072c6f9ac624f6850b95

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=da36382

[Tammo Spalink, 2011-02-16 10:34:42]

lgtm