libxl: Move virDomainXMLOptionNew into libxlCreateXMLConf

To allow the test suite to creat the XML option object,
move the virDomainXMLOptionNew call into a libxlCreateXMLConf
method.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/libxl/libxl_conf.c

@@ -1336,3 +1336,11 @@ libxlBuildDomainConfig(virPortAllocatorPtr graphicsports,
 
     return 0;
 }
+
+virDomainXMLOptionPtr
+libxlCreateXMLConf(void)
+{
+    return virDomainXMLOptionNew(&libxlDomainDefParserConfig,
+                                 &libxlDomainXMLPrivateDataCallbacks,
+                                 NULL);
+}

src/libxl/libxl_conf.h

@@ -158,6 +158,9 @@ libxlMakeVfb(virPortAllocatorPtr graphicsports,
 int
 libxlMakePCI(virDomainHostdevDefPtr hostdev, libxl_device_pci *pcidev);
 
+virDomainXMLOptionPtr
+libxlCreateXMLConf(void);
+
 int
 libxlBuildDomainConfig(virPortAllocatorPtr graphicsports,
                        virDomainDefPtr def,

src/libxl/libxl_driver.c

@@ -353,9 +353,7 @@ libxlStateInitialize(bool privileged,
         goto error;
     }
 
-    if (!(libxl_driver->xmlopt = virDomainXMLOptionNew(&libxlDomainDefParserConfig,
-                                                       &libxlDomainXMLPrivateDataCallbacks,
-                                                       NULL)))
+    if (!(libxl_driver->xmlopt = libxlCreateXMLConf()))
         goto error;
 
     /* Load running domains first. */