[autotest] Make suite:storagequal run on branch>=31

The test suite was introduced crosreview.com/64360.
Branches older than R31 won't have the test suite.
Change suite_scheduler.ini to make it run only on branch>=31

BUG=chromium:306857
TEST=None

Change-Id: I53be07818d225caf38fcaeed9da9fe2413db515d
Reviewed-on: https://chromium-review.googlesource.com/173589
Reviewed-by: Alex Miller <milleral@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: David James <davidjames@chromium.org>
1 file changed