Generate systemd unit files for containers

the podman generate systemd command will generate a systemd unit file
based on the attributes of an existing container and user inputs.  the
command outputs the unit file to stdout for the user to copy or
redirect.  it is enabled for the remote client as well.

users can set a restart policy as well as define a stop timeout
override for the container.

Signed-off-by: baude <bbaude@redhat.com>

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+% podman-generate Podman Man Pages
+% Brent Baude
+% April 2019
+# NAME
+podman-generate-systemd- Generate Systemd Unit file
+
+# SYNOPSIS
+**podman generate systemd** [*-n*|*--name*] [*-t*|*--timeout*] [*--restart-policy*] *container*
+
+# DESCRIPTION
+**podman generate systemd** will create a Systemd unit file that can be used to control a container.  The
+command will dynamically create the unit file and output it to stdout where it can be piped by the user
+to a file.  The options can be used to influence the results of the output as well.
+
+
+# OPTIONS:
+
+**--name** **-n**
+
+Use the name of the container for the start, stop, and description in the unit file
+
+**--timeout** **-t**
+
+Override the default stop timeout for the container with the given value.
+
+**--restart-policy**
+Set the SystemD restart policy.  The restart-policy must be one of: "no", "on-success", "on-failure", "on-abnormal",
+"on-watchdog", "on-abort", or "always".  The default policy is *on-failure*.
+
+## Examples ##
+
+Create a systemd unit file for a container running nginx:
+
+```
+$ sudo podman generate systemd nginx
+[Unit]
+Description=c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc Podman Container
+[Service]
+Restart=on-failure
+ExecStart=/usr/bin/podman start c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+ExecStop=/usr/bin/podman stop -t 10 c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+KillMode=none
+Type=forking
+PIDFile=/var/lib/containers/storage/overlay-containers/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc/userdata/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc.pid
+[Install]
+WantedBy=multi-user.target
+```
+
+Create a systemd unit file for a container running nginx with an *always* restart policy and 1-second timeout.
+```
+$ sudo podman generate systemd --restart-policy=always -t 1 nginx
+[Unit]
+Description=c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc Podman Container
+[Service]
+Restart=always
+ExecStart=/usr/bin/podman start c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+ExecStop=/usr/bin/podman stop -t 1 c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+KillMode=none
+Type=forking
+PIDFile=/var/lib/containers/storage/overlay-containers/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc/userdata/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc.pid
+[Install]
+WantedBy=multi-user.target
+```
+
+## SEE ALSO
+podman(1), podman-container(1)
+
+# HISTORY
+April 2019, Originally compiled by Brent Baude (bbaude at redhat dot com)