classutils.py: deterministic sorting

The method "prioritized" returns a list sorted by the value
of the "priority" field, in descending order. However, if several
list items have the same priority, the ordering of those items
within the priority-sorted list becomes random. As a consequence,
we may end up with a non-deterministic oe-terminal spawning, as several
terminals have the same priority. So running commands such as

$ bitbake xxx -cdevshell
$ bitbake yyy -cmenuconfig

may spawn a different terminal each time, for example sometimes Gnome
and sometimes Konsole as hey have the same priority.
Rather than modifying the priorities so they all differ, we sub-sort
the list based on (terminal) names.
This way we achieve a deterministic outcome.

[YOCTO#10938]

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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