Add multiIQN tests

* Fix broken rng schema
* Add test input & output files

tests/storagepoolxml2xmlout/pool-iscsi-multiiqn.xml

@@ -0,0 +1,22 @@
+<pool type='iscsi'>
+  <name>multiiqn</name>
+  <uuid>e9392370-2917-565e-792c-e057f46512d7</uuid>
+  <capacity>0</capacity>
+  <allocation>0</allocation>
+  <available>0</available>
+  <source>
+    <host name='iscsi.example.com'/>
+    <device path='demo-target'/>
+    <initiator>
+      <iqn name='initiator0'/>
+    </initiator>
+  </source>
+  <target>
+    <path>/dev/disk/by-path</path>
+    <permissions>
+      <mode>0700</mode>
+      <owner>0</owner>
+      <group>0</group>
+    </permissions>
+  </target>
+</pool>