Revert locked ansible version workaround

[aweiteka]

This issue is a placeholder to revert this Dockerfile workaround when openshift/openshift-ansible#3111 is resolved.

# install ansible via pip to lock version
#RUN yum install -y  --setopt=tsflags=nodocs ansible python-pip python-devel && yum clean all -y
RUN yum install -y  --setopt=tsflags=nodocs python-pip python-devel && yum clean all -y
RUN pip install -Iv ansible==2.2.0.0