This update for transactional-update fixes the following issues:

- Update to version 2.11
- Update man page to explain new /etc overlay handling
- Add special handling for migrating away from old overlay directory
- Read default update method for systemd service from config file
- Add package "transactional-update-zypp-config" to prevent accidental
transactional-update uninstallation on transactional systems
(boo#1111319)
- Use "up" for systemd service on non-rolling release distributions
(boo#1111321)
- Introduce /etc overlays
- Add compatibility with snapper >= 0.7.0
- Correctly detect BTRFS ID when using multiple snapper configurations
- Fix disappearing prompt in "shell" command when application was updated
- Prevent accidental rollback on fast reboots (boo#1111786)
- Use zypper attribute packages-to-change if available (boo#1105992 and
boo#1097619)
- Add kexec as reboot alternative
- Added explicit --with-doc / --without-doc build configure opttions for
enforcing or excluding documentation build
- Removed precompiled documentation (boo#1088676)
- Added more dependency checks to configure script
- Small improvements to documentation
- Restored compatibility with older rsync versions not supporting the -x
filter
- Small bugfixes for cleanup in error situations
- Fix possible incorrect detection of snapshots numbers during cleanup
- Mention parent in snapshot description
- Add dependencies for documentation build (boo#1088676)