Upgrade to Jetty 9.4.7.v20170914

Closes gh-10396

spring-boot-dependencies/pom.xml

@@ -111,7 +111,7 @@
 		<jedis.version>2.9.0</jedis.version>
 		<jersey.version>2.26</jersey.version>
 		<jest.version>5.3.2</jest.version>
-		<jetty.version>9.4.6.v20170531</jetty.version>
+		<jetty.version>9.4.7.v20170914</jetty.version>
 		<jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
 		<jetty-el.version>8.5.9.1</jetty-el.version>
 		<jmustache.version>1.13</jmustache.version>

spring-boot-starters/spring-boot-starter-jetty/pom.xml

@@ -39,6 +39,10 @@
 					<groupId>org.eclipse.jetty</groupId>
 					<artifactId>jetty-jndi</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>javax.websocket</groupId>
+					<artifactId>javax.websocket-client-api</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 		<dependency>