public static Specification<Tag> lastModifiedOrCreatedBy(final User user) {
		return (Specification<Tag>) (root, query, cb) -> cb.or(cb.equal(root.get("lastModifiedBy"), user), cb.equal(root.get("createdBy"), user));
	}
Get lastModifiedBy and createBy {@link Specification} to get the {@link Tag} whose creator or last modifier is
the given user.

@param user user
@return {@link Specification}
ngrinder-controller/src/main/java/org/ngrinder/perftest/repository/TagSpecification.java