Enhancement - Add ability to change default route in config.js

[pythianali]

I ran into an issue elastic/kibana#834 and the workaround is to use the logstash.json dashboard as the default one.

Requesting that the ability to configure the default_route parameter in the config.js be made available in the class configuration.

[pythianali]

I did a workaround in my node declaration:

file_line { 'logstash dashboard':
path => '/opt/kibana-latest/config.js',
line => " default_route : '/dashboard/file/logstash.json',",
match => ' default_route',
}

This works well.

[alvagante]

+1.
I'd prepare a config.js template correctly configured, which users might enable with something like:

class { 'kibana':
  file_template => 'kibana/config.js',
} 

and leave two notes in the README.
PR welcomed

[paschdan]

in #8 a basic config.js template was introduced, maybe we can enhance this one after it is merged :)

[alvagante]

merged #8 this might help to manage these cases...