Minor fixes in CAS API

Signed-off-by: Jan Musial <jan.musial@intel.com>

test/functional/api/cas/cache_config.py

@@ -9,7 +9,7 @@ from test_utils.size import Size, Unit
 from datetime import timedelta
 
 
-class CacheLineSize(IntEnum):
+class CacheLineSize(Enum):
     LINE_4KiB = Size(4, Unit.KibiByte)
     LINE_8KiB = Size(8, Unit.KibiByte)
     LINE_16KiB = Size(16, Unit.KibiByte)
@@ -17,6 +17,9 @@ class CacheLineSize(IntEnum):
     LINE_64KiB = Size(64, Unit.KibiByte)
     DEFAULT = LINE_4KiB
 
+    def __int__(self):
+        return int(self.value.get_value())
+
 
 class CacheMode(Enum):
     WT = "Write-Through"