Apply Gaëtan's review suggestion

Co-authored-by: Gaëtan Lehmann <glehmann@users.noreply.github.com>
Signed-off-by: Samuel Verschelde <stormi-xcp@ylix.fr>

Author: stormi

tests/storage/linstor/conftest.py

@@ -8,7 +8,10 @@
 from dataclasses import dataclass
 
 import lib.commands as commands
-from data import LINSTOR_REDUNDANCY
+try:
+    from data import LINSTOR_REDUNDANCY
+except ImportError:
+    LINSTOR_REDUNDANCY = 2
 
 # explicit import for package-scope fixtures
 from pkgfixtures import pool_with_saved_yum_state