So we won't proceed on failure.

Fix-committed: #9833

The command I used for generating our dump was:

    echo '.dump' | sqlite3 ublock0.sqlite | \
      grep -v "cached_asset_content://cache://compiled-" | \
      awk '!/^INSERT/; /^INSERT/ {print $0 | "sort -n"}' | \
      sed 's_\\n_\\n\r\n_g' | \
      sed "/^INSERT INTO \"settings\" VALUES('\(remoteBlacklists\|cached_asset_entries\)'/"'s_,_,\r\n_g' > \
      config/chroot_local-includes/usr/share/tails/ublock-origin/ublock0.dump

The idea is to split lists (including huge strings with escaped
newlines) into separate lines, leaving a CRLF at the end of the line
as a marker -- removing these markers completely restores the file. We
also have to sort the "INSERT" lines since uBlock Origin doesn't save
them in the same order.

Fix-committed: #11556

Fix-committed: 12130

refs: #12130

But only for those applications where we expect that.

Our test suite uses Chutney to create a virtual, private Tor network, and thus
doesn't support connections to Onion services running in the real Tor network.

Too bad this change implies that don't exercise exactly the config we ship
anymore, but well, I don't think this should block addressing issues like
https://www.debian.org/security/2016/dsa-3733.

Note that we test in another, dedicated scenario that the URLs in APT sources
have the right (Onion) hostname.

For some reason, the old image is not recognized by Sikuli anymore.

This reverts commit 13cc5914.

We now fetch onionshare from jessie-backports so we don't need
the custom backport we have in our own repo.

Refs: #7870

This reverts commit fd8c2237.

As discussed on #12081#note-8.

Fix-committed: #12081