Similar to key-directory, check for zones in different views and
different key and signing policies. Zones must be using different key
directories to store key files on disk.
Now that a key directory can be linked with a dnssec-policy key, the
'keydirexist' checking needs to be reshuffled.
Add tests for bad configuration examples, named-checkconf should catch
those. Also add test cases for a mix of key-directory and key-store
directory.
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