Replace http://piuparts.debian.org with https everywhere. Thanks to DSA!
piuparts-report.py: Use "web-host" for summary URL

The new summary.json code was using "master-host". For
p.d.o, that is not valid for the web site. Create a new "web-host"
configuration parameter, and use that for the URLs.
Add python-distro-info to piuparts-common's depends and to build-depends.
release as 0.58
continue development...
Mount selinuxfs read-only and on new location when possible

We need to mount the selinuxfs read-only inside the chroot to make the
userspace think that selinux is disabled. This is required, otherwise
dpkg will fail as no policy is installed in the chroot.

We are also moving the mountpoint of the selinuxfs from /selinux to
/sys/fs/selinux if the /selinux directory is not present on disk. This
directory has been removed in jessie.
Add debian/changelog entry for Laurent Bigonville's patch addressing #682068.
piuparts-report.py: create https URLs in source_summary_url().
fix spelling of "ditto". (Closes: #746724)
TODO: document some bug numbers
temp. ignore debsums results for wheezy2jessie and wheezy2bpo2jessie
piuparts.py: Add to ignored_files: + /etc/sub{g,u}id[-] introduced by shadow 1:4.2-1.
piuparts.conf.sample: explain default location of the file
Install cron files for piupartsm and piupartss users in /usr/share/doc/piuparts-(master|slave)/examples/. (Closes: #746721)
Install piuparts.conf.sample in /usr/share/doc/piuparts-master/examples/.
Install slave_run and slave_join in /usr/bin/ (Closes: #746718)
Fix log directory creation in piuparts-report. (Closes: #746722)
scripts/pre_install_database-server: work around #707075 and force MyISAM storage engine on upgrades from wheezy
fixup: scripts/pre_install_database-server: work around #707075 and force MyISAM storage engine on upgrades from wheezy
fixup: scripts/pre_install_database-server: work around 707075