Add the ability to set pip.conf and configure it

Create an initial pip.conf file and allow passing
several settings such as index url and trusted
hosts.

Change-Id: I78962555c9a9ec1a96ce19810a463a5d619b04f9

manifests/init.pp

@@ -1,10 +1,24 @@
 # Class: pip
 #
-class pip {
+class pip (
+  $index_url = 'https://pypi.python.org/simple',
+  $trusted_hosts = [],
+  $manage_pip_conf = false,
+) {
   include pip::params
+  validate_array($trusted_hosts)
 
   package { $::pip::params::python_devel_package:
     ensure => present,
   }
 
+  if $manage_pip_conf {
+    file { '/etc/pip.conf':
+      owner   => 'root',
+      group   => 'root',
+      mode    => '0444',
+      content => template('pip/pip.conf.erb'),
+      replace => true,
+    }
+  }
 }

templates/pip.conf.erb

@@ -0,0 +1,8 @@
+[global]
+index-url = <%= @index_url %>
+<% if trusted_hosts.length > 0 -%>
+trusted-host =
+<% @trusted_hosts.each do |trusted_host| -%>
+  <%= trusted_host %>
+<% end -%>
+<% end -%>