We're going to need easier access to the IDs of host cores that can be
used for PCPUs going forward. Rename both '_get_pcpu_total' and
'_get_vcpu_total' to '_get_pcpu_available' and '_get_vcpu_available',
respectively, making some minor modifications to ensure the correct
value is returned..
The 'get_cpu_count' function is removed from 'nova.virt.libvirt.host'
since it no longer has any callers.
Change-Id: I98efdc61fd456fc7f9e1a85238c9ef9bc04a1252
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>