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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()
Merge remote-tracking branch 'upstream/SLE-12-GA' into fix_import_openSUSE-13_2
Fixed handling zones

- Checking for system zones was moved to separate function
- Extended list of zones marked as system (internal) ones with (0\.)+ip6.arpa
- Not allowing to edit system zones (belong to bind package)
- Added check for 'bind' package to be installed before writing the configuration
- Marking all imported zones as 'modified' to be written later
- Marking all imported non-system zones as 'is_new' to create a zone file for them
- Flushing /etc/named.conf cache 'after' writing zones (instead of 'before')
- Using "" as the default NETCONFIG_DNS_POLICY (instead of 0)
Adapted test cases the all the previous changes
New changes file entry and a new version
A bit more flexible code
Merge pull request #39 from kobliha/fix_import_SLE12

Fixed handling of zones (import/read)
Merge remote-tracking branch 'upstream/SLE-12-GA' into fix_import_openSUSE-13_2
Merge pull request #37 from kobliha/fix_import_openSUSE-13_2

Fixed AutoYast Import() and Write()