connection: Use shared default pool lookup logic

It wasn't abiding a different pool name pointing to our default
path

virtManager/connection.py

@@ -502,9 +502,12 @@ class vmmConnection(vmmGObject):
         return self._get_flags_helper(vm, key, check_func)
 
     def get_default_pool(self):
-        for p in self.list_pools():
-            if p.get_name() == "default":
-                return p
+        poolxml = virtinst.StoragePool.build_default_pool(
+                self.get_backend(), build=False)
+        if poolxml:
+            for p in self.list_pools():
+                if p.get_name() == poolxml.name:
+                    return p
         return None
 
     def get_vol_by_path(self, path):

virtinst/storage.py

@@ -196,7 +196,7 @@ class StoragePool(_StorageObject):
         return ret
 
     @staticmethod
-    def build_default_pool(conn):
+    def build_default_pool(conn, build=True):
         """
         Attempt to lookup the 'default' pool, but if it doesn't exist,
         create it
@@ -204,6 +204,8 @@ class StoragePool(_StorageObject):
         poolxml = _lookup_default_pool(conn)
         if poolxml:
             return poolxml
+        if not build:
+            return None
 
         try:
             name = "default"