Include Jetty EL dependency in starter

Update spring-boot-starter-jetty to include an EL dependency.

Fixes gh-6692

spring-boot-dependencies/pom.xml

@@ -109,6 +109,7 @@
 		<jest.version>2.0.3</jest.version>
 		<jetty.version>9.3.11.v20160721</jetty.version>
 		<jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
+		<jetty-el.version>8.0.33</jetty-el.version>
 		<jmustache.version>1.12</jmustache.version>
 		<jna.version>4.2.2</jna.version>
 		<joda-time.version>2.9.4</joda-time.version>
@@ -1942,6 +1943,11 @@
 				<artifactId>mongo-java-driver</artifactId>
 				<version>${mongodb.version}</version>
 			</dependency>
+			<dependency>
+			    <groupId>org.mortbay.jasper</groupId>
+			    <artifactId>apache-el</artifactId>
+			    <version>${jetty-el.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.neo4j</groupId>
 				<artifactId>neo4j-ogm-api</artifactId>

spring-boot-samples/spring-boot-sample-data-rest/pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<!-- Your own application should inherit from spring-boot-starter-parent -->
@@ -19,6 +20,20 @@
 		<main.basedir>${basedir}/../..</main.basedir>
 	</properties>
 	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.springframework.boot</groupId>
+					<artifactId>spring-boot-starter-tomcat</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jetty</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-data-jpa</artifactId>

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

@@ -41,6 +41,10 @@
 				</exclusion>
 			</exclusions>
 		</dependency>
+		<dependency>
+			<groupId>org.mortbay.jasper</groupId>
+			<artifactId>apache-el</artifactId>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>