Install amazon jdk and update the sudoer file

- Increase the volume size, default is 8G and too small to install all
required packages
- THe default version of maven in Ubuntu 16.04 is mvn33 but it's mvn36
in Ubuntu 18.04
- We have to setup the JAVA_HOME for mvn36 but we did't do it in our
jobs so all jobs with mvn36 will fail.
- Specify the mvn33

Change-Id: I2560e83d941f6093ee4fe2f1f24bb8b359c2706b
diff --git a/jjb/maven.yaml b/jjb/maven.yaml
index c62e185..ac461dc 100644
--- a/jjb/maven.yaml
+++ b/jjb/maven.yaml
@@ -57,6 +57,7 @@
           settings: 'cord-apps-maven-settings'
           settings-type: cfp
           goals: '-Pci-verify clean test install spotbugs:check'
+          maven-version: '{maven-version}'
 
     publishers:
       - junit: