Accept JSON encoded facts

At https://github.com/puppetlabs/puppet/blob/master/lib/puppet/configurer/fact_handler.rb#L35 we "extra" CGI.escape the facts content we are going to include in the body that gets sent to the master.

We do not need to do this. We should just url encode the whole body that gets sent.

Update (or equivalent):

{:facts_format => :pson, :facts => CGI.escape(text)}

to something like:

{:facts_format => :json, :facts => facts.to_json}