- Do not insert an extra slash into the download URL, this breaks on
some storage providers.
- Do not try to uncompress *.xz files, libcurl cannot handle that
compression, also these are mostly journal files that are compressed
for a good reason.
- Mention the download directory again at the end, avoids needing to
scroll through umpteen log messages in order to find out the name of
the tmpdir generated at the start of the script.
Change-Id: I8eb674121a9808dfc8edfc14b8c3525a77b518ab
a0927f70c8