Fix Jenkins install on Amazon AMI. Fix Ubuntu ISO version.

[kmmceachern]

The provided packer-templates/application-server.json, packer-templates/control-server.json, and packer-templates/scripts/jenkins.sh files all required modifications for me to properly deploy the Virtualbox and AWS Cloud AMI environments.

Changes include:

1. Updating the Ubuntu ISO version (and its associated checksum) to 14.04.5, as 14.04.4 no longer works.
2. Updating the amazon-ebs builder to use an AMI that's supported on AWS free tier accounts.
3. Updating the jenkins.sh script to fix the Java install after viewing an issue with Java 7 and Jenkins here: https://issues.jenkins-ci.org/browse/JENKINS-43495?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&showAll=true

[NawfalTachfine]

somebody should merge this, helped me go further with a google cloud build

[13rac1]

Hi! Thanks for your contribution. In the future, please make these types of changes into multiple commits or better multiple PRs.

• The ISO version was fixed by Replaced ISO name: 'ubuntu-14.04.4-server-amd64' with 'ubuntu-14.04.5… #76, which I selected from the 30 others because it updated both the config and the README.
• The Jenkins change removes unzip and dos2unix which break the install.
• I'll apply the AWS AMI change in a separate commit.