Fixes to speed up the Lustre internal test scripts in order improve testing efficiency.

As a starter, conf-sanity test_54[ab] are taking 30 minutes together to do very low-value testing of the llverdev and llverfs scripts (e.g. https://maloo.whamcloud.com/test_sets/ff31e77a-ca79-11e0-8d02-52540025f9af). It is important to verify those scripts work, but they should only ever do partial testing in conf-sanity, and full runs are usually only done in a separate "large-LUN" test.