Reduce no. of layers for DockerFile

Dockerfile

@@ -2,30 +2,36 @@ FROM totem/python-base:2.7-trusty
 
 ENV DEBIAN_FRONTEND noninteractive
 
-RUN apt-get update --fix-missing
-RUN apt-get install -y openssh-server openssh-client libffi-dev gettext libyaml-dev nano
+RUN apt-get update --fix-missing && apt-get install -y \
+    openssh-server \
+    openssh-client \
+    libffi-dev \
+    gettext \
+    libyaml-dev \
+    nano
 
 ##SSH Server (To troubleshoot issues with discover)
-RUN mkdir /var/run/sshd
-RUN mkdir /root/.ssh
-RUN chmod  500 /root/.ssh & chown -R root:root /root/.ssh
+RUN mkdir /var/run/sshd && \
+    mkdir /root/.ssh && \
+    chmod  500 /root/.ssh && \
+    chown -R root:root /root/.ssh
 
 #Syslog
-RUN echo '$PreserveFQDN on' | cat - /etc/rsyslog.conf > /tmp/rsyslog.conf && sudo mv /tmp/rsyslog.conf /etc/rsyslog.conf
-RUN sed -i 's~^#\$ModLoad immark\(.*\)$~$ModLoad immark \1~' /etc/rsyslog.conf
+RUN echo '$PreserveFQDN on' | cat - /etc/rsyslog.conf > /tmp/rsyslog.conf && \
+    sudo mv /tmp/rsyslog.conf /etc/rsyslog.conf && \
+    sed -i 's~^#\$ModLoad immark\(.*\)$~$ModLoad immark \1~' /etc/rsyslog.conf
 
 #Confd
 ENV CONFD_VERSION 0.6.2
-RUN curl -L https://github.com/kelseyhightower/confd/releases/download/v$CONFD_VERSION/confd-${CONFD_VERSION}-linux-amd64 -o /usr/local/bin/confd
-RUN chmod 555 /usr/local/bin/confd
+RUN curl -L https://github.com/kelseyhightower/confd/releases/download/v$CONFD_VERSION/confd-${CONFD_VERSION}-linux-amd64 -o /usr/local/bin/confd && \
+    chmod 555 /usr/local/bin/confd
 
 #Etcdctl
-RUN echo "Etcd force...."
 ENV ETCDCTL_VERSION v0.4.6
-RUN curl -L https://github.com/coreos/etcd/releases/download/$ETCDCTL_VERSION/etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz -o /tmp/etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz
-RUN cd /tmp && gzip -dc etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz | tar -xof -
-RUN cp -f /tmp/etcd-$ETCDCTL_VERSION-linux-amd64/etcdctl /usr/local/bin
-RUN rm -rf /tmp/etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz
+RUN curl -L https://github.com/coreos/etcd/releases/download/$ETCDCTL_VERSION/etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz -o /tmp/etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz && \
+    cd /tmp && gzip -dc etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz | tar -xof - && \
+    cp -f /tmp/etcd-$ETCDCTL_VERSION-linux-amd64/etcdctl /usr/local/bin && \
+    rm -rf /tmp/etcd-$ETCDCTL_VERSION-linux-amd64.tar.gz
 
 # Supervisor and App dependencies
 RUN pip install supervisor==3.1.2
@@ -35,8 +41,8 @@ RUN pip install -r /opt/requirements.txt
 #Supervisor Config
 RUN mkdir -p /var/log/supervisor
 ADD bin/supervisord-wrapper.sh /usr/sbin/supervisord-wrapper.sh
-RUN chmod +x /usr/sbin/supervisord-wrapper.sh
-RUN ln -sf /etc/supervisor/supervisord.conf /etc/supervisord.conf
+RUN chmod +x /usr/sbin/supervisord-wrapper.sh && \
+    ln -sf /etc/supervisor/supervisord.conf /etc/supervisord.conf
 
 #Confd Defaults
 ADD bin/confd-wrapper.sh /usr/sbin/confd-wrapper.sh