Remove disco support from the charm

Change-Id: Ife734ed43ee213bf328933c58efbdb6387db37ef

metadata.yaml

@@ -10,7 +10,6 @@ tags:
 series:
   - xenial
   - bionic
-  - disco
   - eoan
   - trusty
 subordinate: true

tests/bundles/disco-stein.yaml

@@ -1,59 +0,0 @@
-series: disco
-relations:
-- - cinder-backup:ceph
-  - ceph-mon:client
-- - cinder-ceph:ceph
-  - ceph-mon:client
-- - ceph-osd:mon
-  - ceph-mon:osd
-- - cinder:storage-backend
-  - cinder-ceph:storage-backend
-- - cinder:backup-backend
-  - cinder-backup:backup-backend
-- - keystone:shared-db
-  - percona-cluster:shared-db
-- - cinder:shared-db
-  - percona-cluster:shared-db
-- - cinder:identity-service
-  - keystone:identity-service
-- - cinder:amqp
-  - rabbitmq-server:amqp
-applications:
-  percona-cluster:
-    charm: cs:~openstack-charmers-next/percona-cluster
-    num_units: 1
-    options:
-      innodb-buffer-pool-size: 256M
-      max-connections: 1000
-  keystone:
-    charm: cs:~openstack-charmers-next/keystone
-    num_units: 1
-  rabbitmq-server:
-    charm: cs:~openstack-charmers-next/rabbitmq-server
-    num_units: 1
-  ceph-mon:
-    charm: cs:~openstack-charmers-next/ceph-mon
-    num_units: 3
-    options:
-      monitor-count: '3'
-      auth-supported: 'none'
-  ceph-osd:
-    charm: cs:~openstack-charmers-next/ceph-osd
-    num_units: 3
-    storage:
-      osd-devices: 'cinder,10G'
-  cinder:
-    charm: cs:~openstack-charmers-next/cinder
-    num_units: 1
-    options:
-      block-device: 'None'
-      glance-api-version: '2'
-  cinder-backup:
-    charm: ../../../cinder-backup
-    series: disco
-    options:
-      ceph-osd-replication-count: 3
-  cinder-ceph:
-    charm: cs:~openstack-charmers-next/cinder-ceph
-    options:
-      ceph-osd-replication-count: 3