create os-image-upload role and change the order of
os-image-api and os-image-registry roles.

Create a new role os-image-upload and change the execution order of
os-image-api and os-image-registry roles in os-image role to make sure
the os-image-api role is executed before os-image-registry role since
glance db_sync use the sql_connection value in
/etc/glance/glance-api.conf.
Add os-image-upload to infrastructure.yml.
Remove the image_upload attribute from environments.

Change-Id: I218b52e1fd0ca68849e6aebd8bac6d8878790fba
Closes-Bug: #1257169
Merge "create os-image-upload role and change the order of os-image-api and os-image-registry roles."