Ian Wienand 2e66778699 Drop Xenial support
With the goals of Ussuri being Python 3.6 [1], the python 3.5
environment on Xenial is too old.  Remove testing and the most obvious
bits of support from devstack.

Also drop claimed support for artful, which is long EOL.

[1] https://governance.openstack.org/tc/reference/runtimes/ussuri.html

Change-Id: Iefcca99904dde76b34efbbfc0e04515dfa5a09e5
2019-11-21 18:38:32 +00:00
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