gluon-node-info: add a script to fix whitespaces within the coordinates

Signed-off-by: kb-light <freifunk@kb-light.de>

package/gluon-node-info/files/lib/gluon/upgrade/520-node-info-whitespace-fix

+#!/usr/bin/lua
+local uci = require('luci.model.uci').cursor()
+
+local sname = uci:get_first('gluon-node-info', 'location')
+if sname then
+  local options = {'longitude', 'latitude', 'altitude'}
+  for _, option in ipairs(options) do
+    local value = uci:get('gluon-node-info', sname, option)
+    if value then
+      uci:set('gluon-node-info', sname, option, value:trim())
+    end
+  end
+  uci:save('gluon-node-info')
+end