tests: Check more network XMLs for schema compliance

This revealed bugs in RNG schema for /network/dns/srv.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

docs/schemas/network.rng

@@ -283,13 +283,21 @@
                   </attribute>
                   <optional>
                     <attribute name="domain"><ref name="dnsName"/></attribute>
+                  </optional>
+                  <optional>
                     <attribute name="target"><text/></attribute>
+                  </optional>
+                  <optional>
                     <attribute name="port">
                       <ref name="unsignedShort"/>
                     </attribute>
+                  </optional>
+                  <optional>
                     <attribute name="priority">
                       <ref name="unsignedShort"/>
                     </attribute>
+                  </optional>
+                  <optional>
                     <attribute name="weight">
                       <ref name="unsignedShort"/>
                     </attribute>

tests/virschematest.c

@@ -208,7 +208,7 @@ mymain(void)
             "domainsnapshotxml2xmlout");
     DO_TEST("interface.rng", "interfaceschemadata");
     DO_TEST("network.rng", "../src/network", "networkxml2xmlin",
-            "networkxml2xmlout");
+            "networkxml2xmlout", "networkxml2confdata");
     DO_TEST("nodedev.rng", "nodedevschemadata");
     DO_TEST("nwfilter.rng", "nwfilterxml2xmlout");
     DO_TEST("secret.rng", "secretxml2xmlin");