[tacker] Recent FT errors

Hi tacker team,

We've several unexpected failures on functional tests since last week or so. It might be because of new tests introduced in the recent some updates, and some lackness of resources on zuul tests we usually meet the same situation at the end of release possibly.

Thanks to ueha to propose a patch [1] as a remedy for the issue, but it doesn't work for now unfortunately. For plan B, we can make the new tests non-voting for a while because it's not related to all reamined patches being reviewed now actually. We can revert it and focus on to fix the problem after RC1 is released. What do you think?

[1] https://review.opendev.org/c/openstack/tacker/+/857551

Yasufumi