… that included records can be parsed in same loop. Added separate test 'dns-zoneparse-include.t' for testing inclusion of other zones. New test is a clone of dns-zoneparse.t but only tests parsing from data in variable and reading from file as when included records are parsed, output and parsed again they're returned in a different format than the expected hash structure due to record grouping by ORIGIN. Added 2x test zones, include-test-zone.db (performs the inclusion with the directives) and included-test-zone.db (is included by the former) as to not impact original test-zone.db. included-test-zone.db has slightly different records to distinguish results in new test. parsing is compliant with specification in RFC1035 and supports domain parameter (which sets the relative origin of the included records) and comment parameter (which isn't used at present).

…ed to set the TTL of all resource records that do not explicitly set a TTL. When a \$TTL directive is not set, the original behavior of inheriting the previously set TTL is used. When neither a \$TTL directive or explicit RR TTL is set, the minimum TTL of the SOA record is used. An additional test dns-zoneparse-dollar-ttl.t has be added to prove that the original behavior is still working. The main test dns-zoneparse.t has been updated to reflect the new behavior as the test zone test-zone.db uses a \$TTL directive. Both of these tests prove the functionality to work in either case.

The directive is used to set the TTL of all resource records that do not explicitly set a TTL.
When a $TTL directive is not set, the original behavior of inheriting the previously set TTL is used.
When neither a $TTL directive or explicit RR TTL is set, the minimum TTL of the SOA record is used.
An additional test dns-zoneparse-dollar-ttl.t has be added to prove that the original behavior is still working.
The main test dns-zoneparse.t has been updated to reflect the new behavior as the test zone test-zone.db uses a $TTL directive.
Both of these tests prove the functionality to work in either case.

… origin following $INCLUDE

…n dns-zoneparse-perl

…dded in this branch.

…b depending on where it is desired to run the test from.