get_vdi_sr_uuid: fix intermediate-style call

In 0a5ea64 the method was moved from
BaseVM to Pool, but an intermediate version had it moved to Host, and
the final version missed the conversion on one call site, breaking
tune_firstboot tests.

Signed-off-by: Yann Dirson <[email protected]>

Author: ydirson

lib/vdi.py

@@ -9,7 +9,7 @@ def __init__(self, uuid, *, host=None, sr=None):
         self.uuid = uuid
         # TODO: use a different approach when migration is possible
         if sr is None:
-            sr_uuid = host.get_vdi_sr_uuid(uuid)
+            sr_uuid = host.pool.get_vdi_sr_uuid(uuid)
             # avoid circular import
             # FIXME should get it from Host instead
             from lib.sr import SR