Load RELP module

[flysen]

Using "remote_servers" hash:

remote_servers  => [
    {
        protocol => 'relp',
},
  ]

Should populate the string

# Load RELP module.
$ModLoad omrelp

Now it has to be declared: remote_type => 'relp',

[saz]

Feel free to send in a PR. The loading of modules isn't the best right now, and I'll be happy to have a good solution for this.

[mdklapwijk]

#301