NFP - Configurator docker build fix

NFP configurator image build was failing due to
the docker build failure. The failure is with
the pip package.

pip package version was very old, and needed
to be upgraded. With this fix image build is fine.

Change-Id: Ib8acab0f1daf943c986d9b8a4dfbc22dd33dc1ff
Closes-Bug: #1669454

gbpservice/contrib/nfp/tools/image_builder/Dockerfile

@@ -12,6 +12,7 @@ RUN apt-get -y update --fix-missing && apt-get -y --force-yes install\
  python-dev
 
 # python dependencies
+RUN python -m pip install -U pip
 RUN pip install\
  python-keystoneclient\
  oslo.config==3.6.0\