various improvements:
* use SUDO when needed
* favor paths relative to the btrace regress directory in the expected output
files, prevents one from being forced to checkout the src tree at /usr/src

various improvements:
* use SUDO when needed
* favor paths relative to the btrace regress directory in the expected output
files, prevents one from being forced to checkout the src tree at /usr/src in
order to make the tests pass

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Test that syntax errors do not trigger sanity checks.