Drop repos with config errors from x/ namespace

There are some repositories in the openstack tenant which are having
persistent errors in their zuul configuration and nobody seems to be
around to fix these errors. Drop these repos from being handled by zuul
in order to get rid of these errors. They can be added back once fixes
have been proposed to fix the errors, which can still happen in gerrit
despite this change.

Change-Id: I7cfeda034f65056b265ff58acd4607b200152cdc

zuul/main.yaml

@@ -1156,7 +1156,6 @@
           - x/flare
           - x/foxnut
           - x/gabbi-tempest
-          - x/gce-api
           - x/gerrit-dash-creator
           - x/giftwrap
           - x/git-nit
@@ -1164,7 +1163,6 @@
           - x/git-repo-manifests
           - x/git-upstream
           - x/gitdm
-          - x/glare
           - x/glare-specs
           - x/gluon
           - x/golang-client
@@ -1208,8 +1206,6 @@
           - x/microstack
           - x/microstack-specs
           - x/mitmstack
-          - x/mixmatch
-          - x/mogan
           - x/mogan-specs
           - x/mogan-ui
           - x/monasca-vagrant
@@ -1225,7 +1221,6 @@
           - x/networking-avaya
           - x/networking-bigswitch
           - x/networking-brocade
-          - x/networking-cisco
           - x/networking-cumulus
           - x/networking-dpm
           - x/networking-edge-vpn
@@ -1399,7 +1394,6 @@
           - x/timmy
           - x/tobiko
           - x/trio2o
-          - x/tripleo-ipa
           - x/turbo-hipster
           - x/vahana
           - x/valence
@@ -1407,7 +1401,6 @@
           - x/valet
           - x/vm-bm-wg
           - x/vmtp
-          - x/vmware-nsx
           - x/vmware-nsx-tempest-plugin
           - x/vmware-nsxlib
           - x/vmware-vspc