THRIFT-3696 Install pip to CentOS Docker images to fix Python builds

This closes #912
diff --git a/build/docker/centos/Dockerfile b/build/docker/centos/Dockerfile
index 4ce4f42..011ccc0 100644
--- a/build/docker/centos/Dockerfile
+++ b/build/docker/centos/Dockerfile
@@ -58,7 +58,7 @@
       python-devel \
       python-setuptools \
       python-twisted-web \
-      python-six
+      python-pip
 
 # Ruby Dependencies
 RUN yum install -y \
diff --git a/build/docker/centos6/Dockerfile b/build/docker/centos6/Dockerfile
index 0e571c5..33d5dad 100644
--- a/build/docker/centos6/Dockerfile
+++ b/build/docker/centos6/Dockerfile
@@ -19,7 +19,8 @@
 FROM centos:6
 MAINTAINER Apache Thrift <dev@thrift.apache.org>
 
-RUN yum install -y \
+RUN yum install -y epel-release && \
+    yum install -y \
       autoconf \
       bison \
       bison-devel \
@@ -36,7 +37,7 @@
       python-devel \
       python-setuptools \
       python-twisted-web \
-      python-six \
+      python-pip \
     && yum clean all
 
 # CMake
diff --git a/build/docker/debian/Dockerfile b/build/docker/debian/Dockerfile
index b6cf4fb..a85d9e1 100644
--- a/build/docker/debian/Dockerfile
+++ b/build/docker/debian/Dockerfile
@@ -55,7 +55,7 @@
     && update-java-alternatives -s java-1.7.0-openjdk-amd64
 
 # Python dependencies
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get install -y --no-install-recommends \
       python-all \
       python-all-dev \
       python-all-dbg \
@@ -64,6 +64,7 @@
       python-twisted \
       python-zope.interface \
       python-pip \
+      python3-dev \
       python3-pip
 
 # Ruby dependencies
diff --git a/build/docker/ubuntu/Dockerfile b/build/docker/ubuntu/Dockerfile
index 44ad147..5180fca 100644
--- a/build/docker/ubuntu/Dockerfile
+++ b/build/docker/ubuntu/Dockerfile
@@ -55,15 +55,16 @@
     && update-java-alternatives -s java-1.7.0-openjdk-amd64
 
 # Python dependencies
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get install -y --no-install-recommends \
       python-all \
-      python-all-dev \
       python-all-dbg \
+      python-all-dev \
+      python-pip \
       python-setuptools \
       python-support \
       python-twisted \
       python-zope.interface \
-      python-pip \
+      python3-dev \
       python3-pip
 
 # Ruby dependencies