Delete SP_REPO_CONSTRAINT_VIOLATION

Signed-off-by: Melanie Retter <melanie.retter@bosch-si.com>

hawkbit-core/src/main/java/org/eclipse/hawkbit/exception/SpServerError.java

@@ -21,10 +21,6 @@ public enum SpServerError {
     *
     */
     SP_REPO_ENTITY_ALRREADY_EXISTS("hawkbit.server.error.repo.entitiyAlreayExists", "The given entity already exists in database"),
-    /**
-    *
-    */
-    SP_REPO_CONSTRAINT_VIOLATION("hawkbit.server.error.repo.constraintViolation", "The given entity violates a constraint"),
     /**
      * 
      */