most of extended server attributes returned in 2.3 api versions should not require admin role

Since microverison 2.3, the responses from server creation (https://developer.openstack.org/api-ref/compute/?expanded=create-server-detail#id8) contains some extra attributes such as the user_data specified to the server. These attributes are also returned in a server GET call. However, only an admin can see these attributes.

It is acceptable that 'OS-EXT-SRV-ATTR:hostname' should be visible to admins only. But all other attributes should be visible to a non-admin user, especially the owner of the server.

  OS-EXT-SERV-ATTR:reservation_id
  OS-EXT-SERV-ATTR:launch_index
  OS-EXT-SERV-ATTR:kernel_id
  OS-EXT-SERV-ATTR:ramdisk_id
  OS-EXT-SERV-ATTR:root_device_name
  OS-EXT-SERV-ATTR:user_data

It is highly desirable for the server's owner to retrieve back the 'user_data' provided when creating the server.

To reproduce this under devstack, compare the raw responses from nova-api using the following two commands:

  openstack --os-compute-version 2.3 --os-username demo --debug server show <your_server>

  openstack --os-compute-version 2.3 --os-username admin --debug server show <your_server