Made /hx* mount points configurable in settings.cfg, and
updated documentation accordingly.
Added support for configuring /hxmetadata1 and /hxmetadata2
with different values.
Added test coverage for changing /hxdepots from the default.
Enhanced test suite.
TEST FAIL NOTE: As of this change, tests are succeeding on all
platforms except CentOS 6. Failures are in the test suite
infrastructure, not related to this change.