Remove optional from struts2-core dependency and remove duplicate dependency

aws#149
aws#159

Author: jogep

aws-serverless-java-container-struts2/pom.xml

@@ -32,7 +32,6 @@
             <groupId>org.apache.struts</groupId>
             <artifactId>struts2-core</artifactId>
             <version>${struts2.version}</version>
-            <optional>true</optional>
             <exclusions>
                 <exclusion>
                     <groupId>commons-io</groupId>
@@ -82,13 +81,6 @@
             <scope>test</scope>
         </dependency>
 
-        <dependency>
-            <groupId>javax.el</groupId>
-            <artifactId>javax.el-api</artifactId>
-            <version>2.2.4</version>
-            <scope>test</scope>
-        </dependency>
-
         <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>jsp-api</artifactId>