Use the passed name argument in remove_dnsha

This appears to be a typo, where self.service_name was used
in the same way as seen in other methods,
but self.service_name is not defined in this class,
or any subclasses of it.

Instead, let's use the `name` argument that is passed to remove_dnsha,
but currently unused.

Closes-Bug: #2037515
Change-Id: I12c561057372c11632b2d97fa1763fc92d89f479

interface_hacluster/common.py

@@ -255,7 +255,7 @@ class ResourceManagement():
         :returns: None
         """
         res_key = 'res_{}_{}_hostname'.format(
-            self.service_name.replace('-', '_'),
+            name.replace('-', '_'),
             self.endpoint_type)
         self.delete_resource(res_key)