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/packer/provision/baseline.yaml b/packer/provision/baseline.yaml
index 1aad172..2c43ecf 100644
--- a/packer/provision/baseline.yaml
+++ b/packer/provision/baseline.yaml
@@ -17,7 +17,7 @@
         dest: /etc/sudoers.d/89-jenkins-user-defaults
         content: |
           Defaults:jenkins !requiretty
-          jenkins ALL=(ALL) NOPASSWD:ALL
+          jenkins ALL = NOPASSWD: /usr/sbin/update-alternatives, /usr/sbin/update-java-alternatives
         validate: /usr/sbin/visudo -cf %s
       become: yes