add configuration of timezone for master

[dirk-thomas]

Instead of #20.

[tfoote]

We'll set it on the host.

For reference: https://forge.puppetlabs.com/saz/timezone and https://github.com/saz/puppet-timezone

example snippet:

class { 'timezone':
timezone => 'Europe/Berlin',
}

[tfoote]

We want America/Los_Angeles