Fix hostdev tests

For <hostdev> element, mode="capabilities" is used only for
block/character device passthrough and thus it fails with pci
passthrough.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

tests/xmlparse-xml/change-hostdevs-out.xml

@@ -33,7 +33,7 @@
         <address bus="0x56" device="0x78"/>
       </source>
     </hostdev>
-    <hostdev mode="capabilities" type="pci" managed="yes">
+    <hostdev mode="subsystem" type="pci" managed="yes">
       <source>
         <address domain="0x4" bus="0x5" slot="0x6" function="0x7"/>
       </source>

tests/xmlparse.py

@@ -549,7 +549,7 @@ class XMLParseTest(unittest.TestCase):
         check = self._make_checker(dev3)
         check("type", "pci")
         check("managed", True, True)
-        check("mode", "subsystem", "capabilities")
+        check("mode", "subsystem", "subsystem")
         check("domain", "0x0", "0x4")
         check("bus", "0x1", "0x5")
         check("slot", "0x2", "0x6")