Remove disco support from the charm

Change-Id: I5106499e5d0f90fe02c07a7668d810a0a97822aa

tests/bundles/disco-stein.yaml

@@ -1,69 +0,0 @@
-series: disco
-applications:
-  ceph-mon:
-    charm: 'cs:~openstack-charmers-next/ceph-mon'
-    num_units: 3
-    options:
-      expected-osd-count: 3
-  ceph-osd:
-    charm: 'cs:~openstack-charmers-next/ceph-osd'
-    num_units: 3
-    storage:
-      osd-devices: 10G
-  ceph-proxy:
-    charm: 'ceph-proxy'
-    num_units: 1
-  ceph-radosgw:
-    charm: 'cs:~openstack-charmers-next/ceph-radosgw'
-    num_units: 1
-  cinder:
-    charm: 'cs:~openstack-charmers-next/cinder'
-    num_units: 1
-    options:
-      block-device: ""
-      ephemeral-unmount: ""
-      glance-api-version: 2
-      overwrite: "false"
-    constraints: mem=2048
-  cinder-ceph:
-    charm: 'cs:~openstack-charmers-next/cinder-ceph'
-    options:
-      restrict-ceph-pools: True
-  keystone:
-    charm: 'cs:~openstack-charmers-next/keystone'
-    num_units: 1
-    options:
-      admin-password: openstack
-      admin-token: ubuntutesting
-    constraints: mem=1024
-  percona-cluster:
-    charm: 'cs:~openstack-charmers-next/percona-cluster'
-    num_units: 1
-    options:
-      dataset-size: 50%
-      max-connections: 1000
-      innodb-buffer-pool-size: 256M
-      root-password: ChangeMe123
-      sst-password: ChangeMe123
-    constraints: mem=4096
-  rabbitmq-server:
-    charm: 'cs:~openstack-charmers-next/rabbitmq-server'
-    num_units: 1
-    constraints: mem=1024
-relations:
-  - - 'ceph-osd:mon'
-    - 'ceph-mon:osd'
-  - - 'ceph-proxy:radosgw'
-    - 'ceph-radosgw:mon'
-  - - 'cinder:amqp'
-    - 'rabbitmq-server:amqp'
-  - - 'cinder:shared-db'
-    - 'percona-cluster:shared-db'
-  - - 'keystone:shared-db'
-    - 'percona-cluster:shared-db'
-  - - 'cinder:identity-service'
-    - 'keystone:identity-service'
-  - - 'cinder-ceph:storage-backend'
-    - 'cinder:storage-backend'
-  - - 'cinder-ceph:ceph'
-    - 'ceph-proxy:client'