THRIFT-3910 Do not invoke pip as part of build process

This closes #1073
diff --git a/build/docker/centos/Dockerfile b/build/docker/centos/Dockerfile
index f544a24..a31492b 100644
--- a/build/docker/centos/Dockerfile
+++ b/build/docker/centos/Dockerfile
@@ -56,9 +56,11 @@
 # Python Dependencies
 RUN yum install -y \
       python-devel \
+      python-pip \
       python-setuptools \
-      python-twisted-web \
-      python-pip
+      python-six \
+      python-twisted-web && \
+    pip install -U backports.ssl_match_hostname ipaddress tornado
 
 # Ruby Dependencies
 RUN yum install -y \