Recommended update for rollback-helper

This update for rollback-helper fixes the following issues:

- Check whether system is registered before rollback (bsc#1032129)
- Check if current btrfs snapshot is the production snapshot before re-registering (bsc#1068947)
- Make sure rollback-helper is started only after all filesystems are accessible. This makes sure that checking for the
correct snapshot is properly done and prevents it from thinking there is nothing to do. (bsc#1090073)

This update was imported from the SUSE:SLE-12-SP3:Update update project.

Fixed bugs
bnc#1032129
[Build 0308] SUSEConnect Error: Cannot read username and credentials while booted into snapshot
bnc#1068947
rollback-helper not working with read-only root filesystem
bnc#1090073
rollback-helper can run to early or ignore that there is something to fix
Selected Binaries
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