utilize tox to build

Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>
Change-Id: I945367246c18b73fff0788b9b285a2fc9a897cc9
diff --git a/Dockerfile b/Dockerfile
index 28b7be9..b7a8a91 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,5 @@
 FROM ubuntu:16.04
 
 RUN apt-get update && apt-get -y install git make python python3 \
-    virtualenv libcurl4-gnutls-dev libgnutls-dev python-pip  python3-pip \
-    debhelper python-stdeb apt-utils python-nose python3-nose python-flake8 \
-    python-mock python3-mock
+    libcurl4-gnutls-dev libgnutls-dev tox python-dev python3-dev \
+    debhelper python-setuptools python-all apt-utils