Add mopidyctl script and manpage

Copied from Debian package

extra/mopidyctl/mopidyctl

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+#!/bin/sh
+
+SELF=$(basename $0)
+DAEMON="/usr/bin/mopidy"
+DAEMON_USER="mopidy"
+CONFIG_FILES="/usr/share/mopidy/conf.d:/etc/mopidy/mopidy.conf"
+CMD="$DAEMON --config $CONFIG_FILES $@"
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $SELF [options]" 1>&2
+    echo "Examples:" 1>&2
+    echo "  $SELF --help" 1>&2
+    echo "  $SELF config" 1>&2
+    echo "  $SELF local scan" 1>&2
+    exit 1
+fi
+
+if [ $(id -u) -ne 0 ]; then
+    echo "$SELF must be run as root" 1>&2
+    exit 2
+fi
+
+echo "Running \"$CMD\" as user $DAEMON_USER" 1>&2
+su -s /bin/sh -c "$CMD" -- $DAEMON_USER

extra/mopidyctl/mopidyctl.8

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+.\" Manpage for mopidyctl
+.TH "MOPIDYCTL" "8" "October 11, 2014" "1.0" "mopidyctl"
+.SH NAME
+mopidyctl \- manage the Mopidy music server system service
+.SH SYNOPSIS
+.B mopidyctl
+[any mopidy(1) option]
+.SH DESCRIPTION
+The \fBmopidyctl\fP command runs \fBmopidy\fP subcommands in the
+same environment as the Mopidy system service is running in. That is, as the
+same user and with the same config as the Mopidy system service is using.
+.SH OPTIONS
+mopidyctl(8) takes the same options as mopidy(1).
+.SH SEE ALSO
+mopidy(1)
+.SH COPYRIGHT
+2014, Stein Magnus Jodal and contributors