Support repo upload for meta-agl/meta-agl-demo

Support repo upload for meta-agl/meta-agl-demo

How to setup environment to work 'repo upload'

1. set environment REPO_HOST_PORT_INFO
   $ export REPO_HOST_PORT_INFO="gerrit.automotivelinux.org 29418"

2. set git configuration for username in gerrit
   (Please replace XXXXX to your username in gerrit)

   Edit your ~/.gitconfig

     [review "ssh://gerrit.automotivelinux.org:29418"]
         username = XXXXX

   Or use this command
   $ git config --global review."ssh://gerrit.automotivelinux.org:29418".username XXXXX

Change-Id: I5a41b3f67edb7eee929b25522cc55a4e91361c3e
Signed-off-by: Tadao Tanikawa <tanikawa.tadao@jp.panasonic.com>