This adds utility functions join_paths() and normalize_path_slashes(), which do what they
say and not other random surprising things, and a Path() class that can be used to
automatically deal with paths in a chroot, without having to do a lot of joining and
splitting yourself all the time.
It then uses these functions to clean up a lot of the EDD code, and adds some things to
our testdata_log, so we can make test cases from strange machines we see in the wild. It
also makes the EDD code notice and log when it would find more than one matching disk.
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/260