Use internal systemd scripts for DEB packaging

Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>

contrib/init/systemd/docker.service

@@ -1,34 +0,0 @@
-[Unit]
-Description=Docker Application Container Engine
-Documentation=https://docs.docker.com
-After=network-online.target docker.socket firewalld.service
-Wants=network-online.target
-Requires=docker.socket
-
-[Service]
-Type=notify
-# the default is not to use systemd for cgroups because the delegate issues still
-# exists and systemd currently does not support the cgroup feature set required
-# for containers run by docker
-ExecStart=/usr/bin/dockerd -H fd://
-ExecReload=/bin/kill -s HUP $MAINPID
-LimitNOFILE=1048576
-# Having non-zero Limit*s causes performance problems due to accounting overhead
-# in the kernel. We recommend using cgroups to do container-local accounting.
-LimitNPROC=infinity
-LimitCORE=infinity
-# Uncomment TasksMax if your systemd version supports it.
-# Only systemd 226 and above support this version.
-#TasksMax=infinity
-TimeoutStartSec=0
-# set delegate yes so that systemd does not reset the cgroups of docker containers
-Delegate=yes
-# kill only the docker process, not all processes in the cgroup
-KillMode=process
-# restart the docker process if it exits prematurely
-Restart=on-failure
-StartLimitBurst=3
-StartLimitInterval=60s
-
-[Install]
-WantedBy=multi-user.target

contrib/init/systemd/docker.socket

@@ -1,12 +0,0 @@
-[Unit]
-Description=Docker Socket for the API
-PartOf=docker.service
-
-[Socket]
-ListenStream=/var/run/docker.sock
-SocketMode=0660
-SocketUser=root
-SocketGroup=docker
-
-[Install]
-WantedBy=sockets.target