Fix regression in daemon.py (from when I dropped "import errno") and
clarify a couple assertion failures.
New methods in hpss.HSI: chdir, hashcreate, hashdelete, hashlist,
    hashverify, lsP
New techniques in testhelp: allow passing args into tests from command
    line, expected_in(regex, haystack)
Test for util.rgxin(), implementation of util.rgxin()
Tests for hpss.HSI()
Remove toolframe where it's not needed in the payload code.

Use testhelp.testroot(), testhelp.testlog(), testhelp.testdata() to
locate test log file, data directory and where all the testing should
happen.

Add hpss.HSI tests.