The sanity.sh test_224b() that was added for LU-1039 takes over 15 minutes to complete just that one subtest (e.g. https://maloo.whamcloud.com/sub_tests/3d7bc580-ef9c-11e1-bdf7-52540035b04c). This needs to be improved so that it doesn't waste so much testing time (3-4h or more each day for all of the test nodes).

This appears to be because it is not timing out until AT max (900s) is hit.

We need a patch to change this test to reduce AT_max just for this test so that the test can complete more quickly.