tests: storagepoolxml2xmltest: Fix pool-rbd test

This test failed for two reasons:
* The uuid was missing from the input file
* The output file had the <name> in a different place from the actual output

tests/storagepoolxml2xmlin/pool-rbd.xml

 <pool type='rbd'>
   <name>ceph</name>
+  <uuid>47c1faee-0207-e741-f5ae-d9b019b98fe2</uuid>
   <source>
     <name>rbd</name>
     <host name='localhost' port='6789'/>

tests/storagepoolxml2xmlout/pool-rbd.xml

@@ -5,9 +5,9 @@
   <allocation unit='bytes'>0</allocation>
   <available unit='bytes'>0</available>
   <source>
-    <name>rbd</name>
     <host name='localhost' port='6789'/>
     <host name='localhost' port='6790'/>
+    <name>rbd</name>
     <auth type='ceph' username='admin'>
       <secret uuid='2ec115d7-3a88-3ceb-bc12-0ac909a6fd87'/>
     </auth>