Fix broken CentOS tests; 'DistributionNotFound: jinja2'.

tests/Dockerfile.centos-6

@@ -3,17 +3,13 @@ FROM centos:6
 # Install Ansible
 RUN yum -y update; yum clean all;
 RUN yum -y install epel-release
-RUN yum -y install git python-setuptools gcc sudo libffi-devel python-devel openssl-devel
+RUN yum -y install git ansible sudo
 RUN yum clean all
-RUN easy_install pip
-RUN pip install ansible
-
 
 # Disable requiretty
 RUN sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers
 
 # Install Ansible inventory file
-RUN mkdir - p /etc/ansible
 RUN echo -e '[local]\nlocalhost ansible_connection=local' > /etc/ansible/hosts
 
 CMD ["/usr/sbin/init"]

tests/Dockerfile.centos-7

@@ -13,16 +13,14 @@ rm -f /lib/systemd/system/basic.target.wants/*; \
 rm -f /lib/systemd/system/anaconda.target.wants/*;
 
 # Install Ansible
-RUN yum -y install git python-setuptools gcc sudo libffi-devel python-devel openssl-devel
+RUN yum -y install epel-release
+RUN yum -y install git ansible sudo
 RUN yum clean all
-RUN easy_install pip
-RUN pip install ansible
 
 # Disable requiretty
 RUN sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers
 
 # Install Ansible inventory file
-RUN mkdir - p /etc/ansible
 RUN echo -e '[local]\nlocalhost ansible_connection=local' > /etc/ansible/hosts
 
 VOLUME ["/sys/fs/cgroup"]