Switch neutron-rally-task job to ML2/OVS and skip "test_models_sync"

After switch of the default Neutron backend to the ML2/OVN
in the Devstack we had 2 rally jobs running actually with the
same Neutron backend.

This patch configures explicitly ML2/OVS as a backend in the
'neutron-rally-task' job so it is like it was before the change in
the Devstack repo.

In order to fix the CI, this patch also skips "test_models_sync" test
cases. Once [1] is fixed and released, we'll be able to create SQL
tables specifying the "_constraints_included" flag. When creating a
table, this flag should be set to "False" in order to be able to set
the "index" and "unique" parameters for each column in the table
definition, as we do now.

"test_update_router_admin_state" is excluded from
"neutron-ovn-tempest-slow" until LP#1890445 is fixed.

Set "test_restart_wsgi_on_sighup_multiple_workers" as unstable.

CI job "neutron-ovn-tempest-slow" has been set to non-voting until
LP#1930402 is fixed.

Related-Bug: #1929518
Related-Bug: #1890445
Related-Bug: #1930402
Related-Bug: #1930367

[1]https://github.com/sqlalchemy/alembic/issues/848

Change-Id: I38ed7931169434fecbbefa3762f51a522ef3c509

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