Adding fedora 23 to the Docker tests on travis

test/utils/docker/fedora23/Dockerfile

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+# Latest version of centos
+FROM fedora:23
+RUN dnf -y update; dnf clean all
+RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == systemd-tmpfiles-setup.service ] || rm -f $i; done); \
+rm -f /lib/systemd/system/multi-user.target.wants/*; \
+rm -f /etc/systemd/system/*.wants/*; \
+rm -f /lib/systemd/system/local-fs.target.wants/*; \
+rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
+rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
+rm -f /lib/systemd/system/basic.target.wants/*; \
+rm -f /lib/systemd/system/anaconda.target.wants/*;
+RUN dnf -y install \
+    dbus-python \
+    file \
+    findutils \
+    git \
+    make \
+    mercurial \
+    procps \
+    PyYAML \
+    python-coverage \
+    python2-dnf \
+    python-httplib2 \
+    python-jinja2 \
+    python-keyczar \
+    python-mock \
+    python-nose \
+    python-paramiko \
+    python-pip \
+    python-setuptools \
+    python-virtualenv \
+    rubygems \
+    subversion \
+    sudo \
+    tar \
+    unzip \
+    which \
+    yum
+RUN /usr/bin/sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers
+RUN mkdir /etc/ansible/
+RUN /usr/bin/echo -e '[local]\nlocalhost ansible_connection=local' > /etc/ansible/hosts
+VOLUME /sys/fs/cgroup /run /tmp
+ENV container=docker
+CMD ["/usr/sbin/init"]