Remove cyborg-tempest-plugin from BLACKLIST

This commit removes the cyborg-tempest-plugin entry from the BLACKLIST
since the patch was already merged and this plugin should pass the
sanity job now.

Change-Id: Ifec2e45761961bc4dfc3b5c11709c0ac9e81855f
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index f07410f..e4f39b5 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -43,7 +43,6 @@
 BLACKLIST = [
     'openstack/barbican-tempest-plugin',
     # https://review.opendev.org/#/c/634631/
-    'openstack/cyborg-tempest-plugin',  # https://review.opendev.org/659687
     'x/gce-api',  # It looks gce-api doesn't support python3 yet.
     'x/intel-nfv-ci-tests',  # https://review.opendev.org/#/c/634640/
     'x/networking-ansible',  # https://review.opendev.org/#/c/634647/