build change: Set build version in buildroot config

Set the openwrt build version to be the version of AREDN.

We don't currently use the OpenWRT version anywhere

This will be useful for implementing /etc/banner version tagging

Change-Id: I484564d28ae2f2e9f6017c038efe288bf1809ce1

build/buildsteps/kconfig/099-release_version

@@ -0,0 +1,46 @@
+#!/bin/sh
+<<'LICENSE'
+  Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
+  Copyright (C) 2016 Conrad Lara
+   See Contributors file for additional contributors
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation version 3 of the License.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+  Additional Terms:
+
+  Additional use restrictions exist on the AREDN(TM) trademark and logo.
+    See AREDNLicense.txt for more info.
+
+  Attributions to the AREDN Project must be retained in the source code.
+  If importing this code into a new or existing project attribution
+  to the AREDN project must be added to the source code.
+
+  You must not misrepresent the origin of the material conained within.
+
+  Modified versions must be modified to attribute to the original source
+  and be marked in reasonable ways as differentiate it from the original
+  version.
+
+LICENSE
+
+if [ ! -z "$BUILD_SET_VERSION" ]; then
+  MYBUILDNAME="$BUILD_SET_VERSION"
+else
+  SHORT_COMMIT=$(echo "$GIT_COMMIT" | awk  '{ string=substr($0, 1, 8); print string; }' )
+  SHORT_BRANCH=$(echo "$GIT_BRANCH" | awk 'match($0,"/"){print substr($0,RSTART+1)}')
+  MYBUILDNAME="${SHORT_BRANCH}-${BUILD_NUMBER}-${SHORT_COMMIT}"
+fi
+
+cat << EOF
+CONFIG_VERSION_NUMBER=$MYBUILDNAME
+EOF