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/
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index f1003a0..c18f109 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -56,7 +56,6 @@
     # https://review.opendev.org/#/c/637718/
     'openstack/neutron-vpnaas',  # https://review.opendev.org/#/c/637719/
     'x/valet',  # https://review.opendev.org/#/c/638339/
-    'x/ranger-tempest-plugin',  # It looks this doesn't work correctly yet.
 ]
 
 url = 'https://review.opendev.org/projects/'