This commit fixes the module-level docstrings for the tests and helper
modules in qa. Many of these tests were uncommented previously - this
commit ensures that every test case has at least a minimum level of
commenting.
fad8cf6 [qa] Use single cache dir for chains (MarcoFalke)
fa2d68f [qa] Adjust timeouts for micro-optimization of run time (MarcoFalke)
fae596f [qa] Sort scripts by time for pull_tester and don't overwrite setup_chain (MarcoFalke)