DIB: Drop pip-and-virtualenv element

We've been maintaining our own element for this but should be using the
one in upstream DIB.  The URL for get-pip.py is outdated and overriding
the functional element in DIB-proper.

Change-Id: I592015061d83c2e8dfb3ddd94cf29cd5013311c1
Closes-bug: #1536410

diskimage-builder/elements/pip-and-virtualenv/README.md

@@ -1,21 +0,0 @@
-Install latest pip and virtualenv
-=================================
-
-We have problems with the latest binary package of pip and virtualenv.
-Packaged version of pip can be old and virtualenv can also contain its
-own version of pip. Issues include downloading packages from a local
-pypi mirror that include a wheel package for pip.
-
-The element follows the instructions from the pip website here:
-http://www.pip-installer.org/en/latest/installing.html on how to install
-the latest version of pip. That is to download get-pip.py and run this
-file.
-
-We use source-repositories element to download the file so it will be
-cached and can be overridden to use package if that is required.
-
-NOTICE
-------
-This element is copied from the OpenStack Tripleo project at
-http://git.openstack.org/cgit/openstack/tripleo-image-elements/
-

diskimage-builder/elements/pip-and-virtualenv/element-deps

@@ -1,2 +0,0 @@
-package-installs
-source-repositories

diskimage-builder/elements/pip-and-virtualenv/install.d/get-pip-py-package-install/package-installs-pip-and-virtualenv

@@ -1,2 +0,0 @@
-python-pip
-python-virtualenv

diskimage-builder/elements/pip-and-virtualenv/install.d/get-pip-py-source-install/01-install-pip

@@ -1,6 +0,0 @@
-#!/bin/bash
-
-set -eux
-
-python /tmp/get-pip.py
-pip install virtualenv

diskimage-builder/elements/pip-and-virtualenv/source-repository-pip-and-virtualenv

@@ -1 +0,0 @@
-get-pip-py file /tmp/get-pip.py https://raw.githubusercontent.com/pypa/pip/master/contrib/get-pip.py