Add dependency on spring-aop to ensure it will end in the distribution

git-svn-id: https://svn.apache.org/repos/asf/servicemix/branches/servicemix-3.2.1@598950 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/distributions/apache-servicemix/pom.xml b/distributions/apache-servicemix/pom.xml
index 200ba05..b580505 100644
--- a/distributions/apache-servicemix/pom.xml
+++ b/distributions/apache-servicemix/pom.xml
@@ -179,6 +179,11 @@
     </dependency>
     <dependency>
         <groupId>org.springframework</groupId>
+        <artifactId>spring-aop</artifactId>
+        <version>${spring-version}</version>
+    </dependency>
+    <dependency>
+        <groupId>org.springframework</groupId>
         <artifactId>spring-dao</artifactId>
         <version>${spring-version}</version>
     </dependency>