Add three more test cases that detect a configuration error if the
key-directory is inherited but has the same value for a zone in a
different view with a deviating DNSSEC policy.
Add two tests to make sure named-checkconf catches key-directory issues
where a zone in multiple views uses the same directory but has
different dnssec-policies. One test sets the key-directory specifically,
the other inherits the default key-directory (NULL, aka the working
directory).
Also update the good.conf test to allow zones in different views
with the same key-directory if they use the same dnssec-policy.
Also allow zones in different views with different key-directories if
they use different dnssec-policies.
Also allow zones in different views with the same key-directories if
only one view uses a dnssec-policy (the other is set to "none").
Also allow zones in different views with the same key-directories if
no views uses a dnssec-policy (zone in both views has the dnssec-policy
set to "none").
