tests: qemublock: Switch to qcow2+luks in test files

The next patch will forbid the old qcow2 encryption completely. Remove
it from the tests.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-encryption.json

@@ -21,7 +21,7 @@
   "read-only": true,
   "driver": "qcow2",
   "encrypt": {
-    "format": "aes",
+    "format": "luks",
     "key-secret": "node-b-f-encalias"
   },
   "file": "node-b-s",

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-encryption.xml

@@ -20,7 +20,7 @@
           <nodename type='format' name='node-b-f'/>
         </nodenames>
       </privateData>
-      <encryption format='qcow'>
+      <encryption format='luks'>
         <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
       </encryption>
     </source>

tests/qemublocktestdata/xml2json/network-qcow2-backing-chain-encryption_auth.json

@@ -33,7 +33,7 @@
   "read-only": true,
   "driver": "qcow2",
   "encrypt": {
-    "format": "aes",
+    "format": "luks",
     "key-secret": "node-b-f-encalias"
   },
   "file": "node-b-s",

tests/qemublocktestdata/xml2json/network-qcow2-backing-chain-encryption_auth.xml

@@ -26,7 +26,7 @@
           <nodename type='format' name='node-b-f'/>
         </nodenames>
       </privateData>
-      <encryption format='qcow'>
+      <encryption format='luks'>
         <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
       </encryption>
       <auth username='testuser-iscsi'>