Add util/openssl-update-copyright shell script

usage: openssl-update-copyright [-h|--help] [file|directory] ...

Updates the year ranges of all OpenSSL copyright statements in the given
files or directories. (Directories are traversed recursively.)

Only copyright statements containing the string 'The OpenSSL Project' are
affected. The copyright time range is adjusted to include the current year.
If only a single year was specified, it is replaced by a time range starting
at that year and ending at the current year. All '(c)' and '(C)' signs are
preserved.
Signed-off-by: NDr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5027)

util/openssl-update-copyright

+#!/bin/bash
+#
+# Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+
+myname="$(basename $0)"
+
+this_year="$(date '+%Y')"
+some_year="[12][0-9][0-9][0-9]"
+
+copyright_owner="The OpenSSL Project"
+
+search="Copyright \(([cC]) \)\?\(${some_year}\)\(-${some_year}\)\? ${copyright_owner}"
+replace="Copyright \1\2-${this_year} ${copyright_owner}"
+
+
+function usage() {
+	cat >&2 <<EOF
+usage: $myname [-h|--help] [file|directory] ...
+
+Updates the year ranges of all OpenSSL copyright statements in the given
+files or directories. (Directories are traversed recursively.)
+EOF
+}
+
+if [ $# -eq 0 ]; then
+	usage
+	exit 0
+fi
+
+
+for arg in "$@"; do
+	case $arg in
+		-h|--help)
+			usage
+			exit 0
+			;;
+		-*)
+			echo -e "illegal option: $arg\n" >& 2
+			usage
+			exit 1
+			;;
+		*)
+			if [ -f "$arg" ]; then
+				sed -i "s/${search}/${replace}/g" "$arg"
+			elif [ -d "$arg" ]; then
+				find "$arg" -name '.[a-z]*' -prune -o -type f -exec sed -i "s/${search}/${replace}/g" {} +
+			else
+				echo "$arg: no such file or directory" >&2
+			fi
+			;;
+	esac
+done