Fix the puppet-pip module to install pip

The class pip does not install pip, as one
would expect.
This fixes it.

Change-Id: I926cbfc1f65805c29a72597eede8c47228bdee30

manifests/init.pp

@@ -12,6 +12,11 @@ class pip (
     ensure => present,
   }
 
+  exec { 'download-pip':
+    command => "/usr/bin/curl ${::pip::params::get_pip_location} | /usr/bin/python",
+    creates => '/usr/local/bin/pip',
+  }
+
   if $manage_pip_conf {
     file { '/etc/pip.conf':
       owner   => 'root',

manifests/params.pp

@@ -3,9 +3,11 @@
 # This class holds parameters that need to be
 # accessed by other classes.
 class pip::params {
+  $get_pip_location = 'https://bootstrap.pypa.io/get-pip.py'
+
   case $::osfamily {
     'RedHat': {
-      $python_devel_package = 'python-devel'
+      $python_devel_package  = 'python-devel'
       $python3_devel_package = 'python3-devel'
       $python3_pip_package   = 'python3-pip'
     }