parseconf: Add an authority IPv6 ORPort test

These tests don't actually exercise the authority IPv6 ORPort
self-add feature in 32822, but they do improve coverage of the
related config code.

Part of 32822.

src/test/conf_examples/dirauth_3/error_no_dirauth

@@ -0,0 +1 @@
+This tor was built with dirauth mode disabled.

src/test/conf_examples/dirauth_3/error_no_dirauth_relay

@@ -0,0 +1 @@
+This tor was built with dirauth mode disabled.

src/test/conf_examples/dirauth_3/expected

@@ -0,0 +1,9 @@
+Address 192.0.2.1
+AuthoritativeDirectory 1
+ContactInfo tor_parse_test@example.net
+DirPort 192.0.2.1:2
+DownloadExtraInfo 1
+Nickname Unnamed
+ORPort 192.0.2.1:1
+ORPort [2001:DB8::1]:3
+V3AuthoritativeDirectory 1

src/test/conf_examples/dirauth_3/expected_log

@@ -0,0 +1 @@
+Read configuration file .*dirauth_3[./]*torrc

src/test/conf_examples/dirauth_3/torrc

@@ -0,0 +1,13 @@
+# Authority with IPv6 address
+
+AuthoritativeDirectory 1
+V3AuthoritativeDirectory 1
+
+ContactInfo tor_parse_test@example.net
+
+Address 192.0.2.1
+
+ORPort 192.0.2.1:1
+DirPort 192.0.2.1:2
+
+ORPort [2001:DB8::1]:3