nova.virt.hardware.InstanceInfo had several fields that have never been
used since their inception two and a half years ago [1]. This change set
removes them. They are (were):
max_mem_kb: (int) the maximum memory in KBytes allowed
mem_kb: (int) the memory in KBytes used by the instance
num_cpu: (int) the number of virtual CPUs for the
instance
cpu_time_ns: (int) the CPU time used in nanoseconds
We also rename the 'id' field to 'internal_id' for two reasons: First,
because 'id' is a builtin; second, to emphasize that this is not
(necessarily) tied to the Instance's real id/uuid.
[1] https://review.openstack.org/#/c/133777
Change-Id: I5fe5c8121800e2b8da0860d53d818b7bd83c9e9d
5db9389c01