[#27] Add more modules to CheckStyle

Signed-off-by: Ori Bruk <o.bruk@yadro.com>

models/src/main/java/info/frostfs/sdk/constants/FilterConst.java

@@ -46,4 +46,7 @@ public class FilterConst {
 
     // FILTER_HEADER_PHY is a filter key to check if an object physically stored on a node.
     public static final String FILTER_HEADER_PHY = HEADER_PREFIX + "PHY";
+
+    private FilterConst() {
+    }
 }