Upgrade mockserver to last version before API change

Change-Id: Iccefa7f961e88e02ba1bd12c2b50ce6cda8f2f15
diff --git a/plugin/pom.xml b/plugin/pom.xml
index d332116..91e04ee 100644
--- a/plugin/pom.xml
+++ b/plugin/pom.xml
@@ -80,7 +80,7 @@
     <dependency>
 	    <groupId>org.mock-server</groupId>
       <artifactId>mockserver-netty</artifactId>
-      <version>3.10.2</version>
+      <version>5.1.1</version>
 	    <scope>test</scope>
     </dependency>