Install pip using get-pip in launch node

packaged pip vs. upstream pip gets the systems very broken. Make launch-node
use get-pip to install pip as per:

http://www.pip-installer.org/en/latest/installing.html

Change-Id: Ice28b47d766c04b42462a7297911dc1a1abe5a77

manifests/init.pp

@@ -7,9 +7,4 @@ class pip {
     ensure => present,
   }
 
-  package { $::pip::params::python_pip_package:
-    ensure  => present,
-    require => Package[$::pip::params::python_devel_package]
-  }
-
 }

manifests/params.pp

@@ -6,13 +6,11 @@ class pip::params {
   case $::osfamily {
     'RedHat': {
       $python_devel_package = 'python-devel'
-      $python_pip_package   = 'python-pip'
       $python3_devel_package = 'python3-devel'
       $python3_pip_package   = 'python3-pip'
     }
     'Debian': {
       $python_devel_package  = 'python-all-dev'
-      $python_pip_package    = 'python-pip'
       $python3_devel_package = 'python3-all-dev'
       $python3_pip_package   = 'python3-pip'
     }