Remove vitrage-tempest-plugin from blacklist

This commit removes vitrage-tempest-plugin from the BLACKLIST since the
patch[0] was already merged.

NOTE: The patch on the comment[1] was duplicated of [0]. So it was
abandoned.

[0] https://review.opendev.org/#/c/638931/

Change-Id: I5539159bad10b3359981fab88b3be5e4e997fcb9
diff --git a/tools/tempest-plugin-sanity.sh b/tools/tempest-plugin-sanity.sh
index 015b2b7..b291fcc 100644
--- a/tools/tempest-plugin-sanity.sh
+++ b/tools/tempest-plugin-sanity.sh
@@ -59,7 +59,7 @@
 # neutron-vpnaas: https://review.opendev.org/#/c/637719/
 # nova-lxd: https://review.opendev.org/#/c/638334/
 # valet: https://review.opendev.org/#/c/638339/
-# vitrage-tempest-plugin: https://review.opendev.org/#/c/639003/
+
 BLACKLIST="
 barbican-tempest-plugin
 cyborg-tempest-plugin
@@ -74,7 +74,6 @@
 neutron-vpnaas
 nova-lxd
 valet
-vitrage-tempest-plugin
 "
 
 # Function to clone project using zuul-cloner or from git