integration: setup trash directory in /tmp

[brandon1024]

Rather than keeping the integration test trash directory around, we can create a temporary directory in /tmp and run the test there.

We should also add an integration test option --archive-trash that will automatically compress the trash directory in a tarball when a test fails, so that we can go back and see the state of the trash directory when a test fails.

We should cleanup the integration runner script too. It's a bit wild in there.