Add simple tests for pdnsutil add-record behaviour.

regression-tests/tests/pdnsutil-zone-handling/command

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+#!/bin/sh
+
+# This one is redirected to /dev/null to hide the "local files have been
+# created" message if using lmdb as backend.
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	create-zone bug.less > /dev/null 2>&1
+# All other pdnsutil invocation have the Ueberbackend destructor messages from
+# --enable-verbose-logging removed.
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	add-record bug.less cname CNAME host 2>&1 | grep -v Ueber
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	add-record bug.less host A 127.0.0.1 2>&1 | grep -v Ueber
+# Duplicate records should be omitted
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	add-record bug.less host2 A 127.0.0.2 127.0.0.2 2>&1 | grep -v Ueber
+# Can't add non-CNAME record to a CNAME record
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	add-record bug.less cname A 127.0.0.1 2>&1 | grep -v Ueber
+# Can't add CNAME record if other records exist
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	add-record bug.less host CNAME host2 2>&1 | grep -v Ueber
+# Adding existing record should ignore duplicates
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	add-record bug.less host2 A 127.0.0.2 127.0.0.3 2>&1 | grep -v Ueber
+
+# Display zone contents for final verification
+$PDNSUTIL --config-dir=. --config-name=$backend \
+	list-zone bug.less 2>&1 | grep -v Ueber

regression-tests/tests/pdnsutil-zone-handling/description

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+This test checks various pdnsutil behaviour when editing zone contents.

regression-tests/tests/pdnsutil-zone-handling/expected_result

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+New rrset:
+cname.bug.less. 3600 IN CNAME host
+New rrset:
+host.bug.less. 3600 IN A 127.0.0.1
+Ignoring duplicate record content "127.0.0.2"
+New rrset:
+host2.bug.less. 3600 IN A 127.0.0.2
+Attempting to add record to cname.bug.less which already has a CNAME record
+Attempting to add CNAME to host.bug.less which already has existing records
+New rrset:
+host2.bug.less. 3600 IN A 127.0.0.2
+host2.bug.less. 3600 IN A 127.0.0.3
+$ORIGIN .
+bug.less	3600	IN	SOA	a.misconfigured.dns.server.invalid hostmaster.bug.less 0 10800 3600 604800 3600
+cname.bug.less	3600	IN	CNAME	host.
+host.bug.less	3600	IN	A	127.0.0.1
+host2.bug.less	3600	IN	A	127.0.0.2
+host2.bug.less	3600	IN	A	127.0.0.3