UEFI tests: in pool join tests, fail if second pool not in right version

Previously, the test would be skipped. We want it to be an error.

Signed-off-by: Samuel Verschelde <[email protected]>

tests/uefi_sb/test_cert_inheritance.py

@@ -264,7 +264,7 @@ def keys_auths_for_joined_host(self, host, hostB1):
         from packaging import version
         version_str = "8.3"
         if not hostB1.xcp_version >= version.parse(version_str):
-            pytest.skip(f"This test requires a second XCP-ng pool with version >= {version_str}")
+            pytest.fail(f"This test requires a second XCP-ng pool with version >= {version_str}")
 
         # Install certs before host join
         keys = ['PK', 'KEK', 'db', 'dbx']