Add glare and taas to blacklist

This commit adds x/glare and x/tap-as-a-service to the BLACKLIST to
avoid sanity-job failures like following.

 Failed Plugins: x/glare, x/tap-as-a-service,
 + [[ -n x/glare, x/tap-as-a-service,  ]]
 + exit 1

It looks the root cause is related to pg_config installation but not
sure. So, this commit just blacklists them as a workaround.

 Error: pg_config executable not found.

Change-Id: I03c6f01593b8e414b5e111d0e0c971ae156da715
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index c505908..5ffef3e 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -36,6 +36,7 @@
 # when the patches are merged.
 BLACKLIST = [
     'x/gce-api',  # It looks gce-api doesn't support python3 yet.
+    'x/glare',  # To avoid sanity-job failure
     'x/group-based-policy',  # It looks this doesn't support python3 yet.
     'x/intel-nfv-ci-tests',  # https://review.opendev.org/#/c/634640/
     'openstack/networking-generic-switch',
@@ -48,6 +49,7 @@
     'openstack/neutron-dynamic-routing',
     # https://review.opendev.org/#/c/637718/
     'openstack/neutron-vpnaas',  # https://review.opendev.org/#/c/637719/
+    'x/tap-as-a-service',  # To avoid sanity-job failure
     'x/valet',  # https://review.opendev.org/#/c/638339/
     'x/kingbird',  # https://bugs.launchpad.net/kingbird/+bug/1869722
 ]