Remove x/ranger-tempest-plugin from BLACKLIST

This commit removes x/ranger-tempest-plugin from BLACKLIST. The patch[0]
is trying to support the tempest-sanity job. So, when the patch is
merged, we can remove it from BLACKLIST.

[0] https://review.opendev.org/#/c/672585/

Change-Id: Ia7f0bdad9f854c0f6724537e1ca0234f2952aca8
Depends-On: https://review.opendev.org/672585/
1 file changed