Install runlevel symlinks for wowza init-script

Similar to in `socket-redis`, we should install the init-script so it start on system boot with `update-rc.d`:

```puppet
  file {'/etc/init.d/socket-redis':
    ensure => file,
    content => template('socket-redis/init.sh'),
    owner => '0',
    group => '0',
    mode => '0755',
    notify => Service['socket-redis'],
    before => Package['socket-redis'],
  }
  ~>

  exec {'update-rc.d socket-redis defaults':
    path => ['/usr/local/sbin', '/usr/local/bin', '/usr/sbin', '/usr/bin', '/sbin', '/bin'],
    refreshonly => true,
  }
```