[#125] Handle negative Content-Length on put

Add computing actual object size during calculating hash on put.
Use this actual value to save in tree and cache

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/layer/versioning_test.go

@@ -21,7 +21,7 @@ func (tc *testContext) putObject(content []byte) *data.ObjectInfo {
 	extObjInfo, err := tc.layer.PutObject(tc.ctx, &PutObjectParams{
 		BktInfo: tc.bktInfo,
 		Object:  tc.obj,
-		Size:    int64(len(content)),
+		Size:    uint64(len(content)),
 		Reader:  bytes.NewReader(content),
 		Header:  make(map[string]string),
 	})