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upgrade:
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In the libvirt driver, the default value of the ``<cputune><shares>``
element has been removed, and is now left to libvirt to decide. This is
because allowed values are platform dependant, and the previous code was
not guaranteed to be supported on all platforms. If any of your flavors are
using the quota:cpu_shares extra spec, you may need to resize to a
supported value before upgrading.
To facilitate the transition to no Nova default for ``<cputune><shares>``,
its value will be removed during live migration unless a value is set in
the ``quota:cpu_shares`` extra spec. This can cause temporary CPU
starvation for the live migrated instance if other instances on the
destination host still have the old default ``<cputune><shares>`` value. To
fix this, hard reboot, cold migrate, or live migrate the other instances.
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