Update Init config usage and remove WI cache mode

test/functional/api/cas/cache_config.py

@@ -26,7 +26,6 @@ class CacheMode(Enum):
     WA = "Write-Around"
     PT = "Pass-Through"
     WO = "Write-Only"
-    WI = "Write-Invalidate"
     DEFAULT = WT
 
     def __str__(self):
@@ -44,15 +43,12 @@ class CacheMode(Enum):
             return CacheModeTrait.InsertWrite | CacheModeTrait.LazyFlush
         elif cache_mode == CacheMode.WA:
             return CacheModeTrait.InsertRead
-        elif cache_mode == CacheMode.WI:
-            return CacheModeTrait.InsertRead | CacheModeTrait.WriteInvalidate
 
 
 class CacheModeTrait(IntFlag):
     InsertWrite = 1
     InsertRead = 2
     LazyFlush = 4
-    WriteInvalidate = 8
 
 
 class SeqCutOffPolicy(Enum):