Make the sanitizing for application metadata case-insensitive

fixes codecentric#590

Author: joshiste

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/model/Application.java

@@ -318,7 +318,7 @@ public MetadataSerializer() {
 		private static Pattern[] createPatterns(String... keys) {
 			Pattern[] patterns = new Pattern[keys.length];
 			for (int i = 0; i < keys.length; i++) {
-				patterns[i] = Pattern.compile(keys[i]);
+				patterns[i] = Pattern.compile(keys[i], Pattern.CASE_INSENSITIVE);
 			}
 			return patterns;
 		}

spring-boot-admin-server/src/test/java/de/codecentric/boot/admin/model/ApplicationTest.java

@@ -81,7 +81,7 @@ public void test_healthUrl_expected() throws Exception {
 	@Test
 	public void test_sanitize_metadata() throws JsonProcessingException {
 		Application app = Application.create("test").withHealthUrl("http://health")
-				.addMetadata("password", "qwertz123").addMetadata("user", "humptydumpty").build();
+				.addMetadata("PASSWORD", "qwertz123").addMetadata("user", "humptydumpty").build();
 		String json = objectMapper.writeValueAsString(app);
 		assertThat(json, not(containsString("qwertz123")));
 		assertThat(json, containsString("humptydumpty"));