The key change here is that the 'GET /os-hypervisors/{id}/uptime' API
will now returns a HTTP 404 starting in 2.88. The 'GET
/os-hypervisors/{id}' will instead now include an 'uptime' value. The
'novaclient.v2.hypervisors.HypervisorManager.uptime' method is updated
to handle this.
Change-Id: Ib99fbd820a586c14527ff64b319df0b7a44e1b8b
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>