[#1168] shard: Set Disabled as default mode for components

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/local_object_storage/writecache/cachebbolt.go

@@ -60,7 +60,7 @@ var defaultBucket = []byte{0}
 func New(opts ...Option) Cache {
 	c := &cache{
 		flushCh: make(chan objectInfo),
-		mode:    mode.ReadWrite,
+		mode:    mode.Disabled,
 
 		compressFlags: make(map[string]struct{}),
 		options: options{