build-unit-test-docker: Directly install pip{,3} via python{3,}-pip packages

Change-Id: Ibe9839ef10e2bba2294d85acdd629706c2ddf259
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index b28a9d4..7850c06 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -61,11 +61,13 @@
     python-git \
     python-yaml \
     python-mako \
+    python-pip \
     python-setuptools \
     python3 \
     python3-dev\
     python3-yaml \
     python3-mako \
+    python3-pip \
     python3-setuptools \
     pkg-config \
     autoconf \
@@ -82,7 +84,6 @@
     libnl-3-dev \
     libnl-genl-3-dev
 
-RUN easy_install pip
 RUN pip install inflection
 RUN pip install pycodestyle