[bs-80] Add configurable / switchable web request trace logging (headers etc)

* Added a bean post processor for the Spring Security filter chain
(so you only get traces by default if security is on)
* Every request is logged at trace level if the dump requests flag is
on
* Requests are also dumped to a TraceRepository for later analysis (very
useful for tracing problems in real time when a support call comes in)

[Fixes #48976001]

spring-bootstrap-samples/spring-bootstrap-service-sample/src/test/java/org/springframework/bootstrap/sample/service/VarzContextServiceBootstrapApplicationTests.java

@@ -91,7 +91,7 @@ public class VarzContextServiceBootstrapApplicationTests {
 	@Test
 	public void testHealthz() throws Exception {
 		ResponseEntity<String> entity = getRestTemplate().getForEntity(
-				"http://localhost:" + managementPort + "healthz", String.class);
+				"http://localhost:" + managementPort + "/healthz", String.class);
 		assertEquals(HttpStatus.OK, entity.getStatusCode());
 		assertEquals("ok", entity.getBody());
 	}