Upgrade Puppet Java module

Upgrade the Puppet module we use to manage Java, from version 0.3.0 to
1.2.0.

Versions 1.1.1 added support for Ubuntu Trusty, which is the reason for
this commit:

https://github.com/puppetlabs/puppetlabs-java/blob/eb54419d098bf4177bce1ab19ee9bda60b038ead/CHANGELOG.md#2014-05-02---version-111

Note that I've removed the explicit version number from the
`Puppetfile`, because the exact version is already pinned by
`Puppetfile.lock` and can only be upgraded by explicitly telling
`librarian-puppet` to do so.
Merge pull request #247 from alphagov/82935274-upgrade_java

[#82935274] Upgrade Puppet Java module