Fix testcases.py formatting

Signed-off-by: Alexey Rokhin <[email protected]>

tests/integration/testcases.py

@@ -75,6 +75,7 @@ def v2_1_only():
     return min_version_skip(V2_1)
 
 
+
 def v2_2_only():
     return min_version_skip(V2_2)
 
@@ -83,6 +84,7 @@ def v2_3_only():
     return min_version_skip(V2_3)
 
 
+
 def v3_only():
     return min_version_skip(V3_0)