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Fixed Import/Write for AutoYast

- Making sure that /etc/named.d/ exists (used for forwarders.conf)
- Marked local IPv6 zone as "system zone"
- Caching named.conf file stat in Import() - used in Write()
- Marking all imported zones as "modified"
New changes file and new version
Test-cases adjusted to the new code
Leftovers from running tests added to .gitignore
Merge pull request #36 from kobliha/fix_import

Fixed AutoYast Import() and Write()