Add ability to configure JRUBY_JAR setting to avoid `undefined method 'keep_alive_timeout=' for #<Net::HTTP..."` errors

[petems]

What are you seeing

Currently, it's not possible to use the module to configure the JRUBY_JAR setting to use the newer 9k JRuby, meaning if you have a gem that requires Ruby > 2.1, you see errors like undefined method 'keep_alive_timeout=' for #<Net::HTTP..." (such as https://github.com/davealden/hiera-vault/issues/5)

Affected Puppet, Ruby, OS and module versions/distributions

• Module version: Latest Commit (356e0785bcf707da001ef1e04d28b296445467f1)

Any additional information you'd like to impart

Current workaround is this quick ini_setting code, but to keep with the rest of the module we could use augeas:

ini_setting { "Change jruby to 9k":
    ensure  => present,
    setting => 'JRUBY_JAR',
    path    => "/etc/sysconfig/puppetserver",
    key_val_separator => '=',
    section => '',
    value   => '"/opt/puppetlabs/server/apps/puppetserver/jruby-9k.jar"',
    show_diff => true,
    notify  => Class['puppetserver::service']
  }