File: source attribute broken for HTTP(s) URI's containing query parameters

Puppet Version: 4.4.0 - 5.5.6
Puppet Server Version: All
OS Name/Version: All

We want to use the `source` attribute of the file type to get host specific stuff from a web service. For this we're using the following code:

file { '/etc/path/to/file':

  ensure => file,

  source => 'https://fancywebservice.example.org/get_host_specific_config.py?host=foobar'

}

The important part here is the `host=foobar` parameter. If it's not added, the web service will return a 404.

Desired Behavior:
The file type should be able to retrieve a file from a http(s) URL which contains query parameters

Actual Behavior:

Error: /Stage[main]/Main/File[/etc/path/to/file]: Could not evaluate: Could not retrieve information from environment production source(s) https://fancywebservice.example.org/get_host_specific_config.py?host=foobar

This happens, because Puppet, for reason unknown to me, requests only the `path` element of the uri and skips on the query parameters:

https://github.com/puppetlabs/puppet/blob/7ec328f0832492353cad5b2b3ae6e90449fa105f/lib/puppet/util/http_proxy.rb#L184

I will submit a PR to fix this.