uri fragments handled incorrectly by CookieHttpSessionStrategy.encodeUrl

[mattluce]

URI Fragments are not handled properly by encodeUrl. See test below.

Using UriComponentsBuilder in encodeUrl fixes this issue.

@Test
public void encodeUrlWithFragment() {
    assertThat(new CookieHttpSessionStrategy().encodeURL("/url?a=b#xyz", "2"))
            .isEqualTo("/url?a=b&_s=2#xyz");
}}