Remove templates for unsupported releases

Grizzly and Havana have been unsupported for some time; remove
templates as they are no longer tested or required.

Change-Id: I97377182fe28e3f7aa98784b537e1a353a58280d

templates/grizzly/ceilometer.conf

-# grizzly
-###############################################################################
-# [ WARNING ]
-# ceilometer configuration file maintained by Juju
-# local changes may be overwritten.
-###############################################################################
-[DEFAULT]
-debug = {{ debug }}
-verbose = {{ verbose }}
-use_syslog = {{ use_syslog }}
-metering_secret = {{ metering_secret }}
-metering_api_port = {{ port }}
-{% include "parts/rabbitmq" %}
-database_connection = mongodb://{{ db_host }}:{{ db_port }}/{{ db_name }}
-os_auth_url = {{ auth_protocol }}://{{ auth_host }}:{{ auth_port }}/v2.0
-os_tenant_name = {{ admin_tenant_name }}
-os_username = {{ admin_user }}
-os_password = {{ admin_password }}
-logdir = /var/log/ceilometer
-[keystone_authtoken]
-auth_host = {{ auth_host }}
-auth_port = {{ auth_port }}
-auth_protocol = {{ auth_protocol }}
-admin_tenant_name = {{ admin_tenant_name }}
-admin_user = {{ admin_user }}
-admin_password = {{ admin_password }}

templates/havana/ceilometer.conf

-# havana
-###############################################################################
-# [ WARNING ]
-# ceilometer configuration file maintained by Juju
-# local changes may be overwritten.
-###############################################################################
-[DEFAULT]
-debug = {{ debug }}
-verbose = {{ verbose }}
-use_syslog = {{ use_syslog }}
-{% include "parts/rabbitmq" %}
-[api]
-port = {{ port }}
-[service_credentials]
-os_auth_url = {{ service_protocol }}://{{ service_host }}:{{ service_port }}/v2.0
-os_tenant_name = {{ admin_tenant_name }}
-os_username = {{ admin_user }}
-os_password = {{ admin_password }}
-[database]
-connection = mongodb://{{ db_host }}:{{ db_port }}/{{ db_name }}
-[publisher_rpc]
-metering_secret = {{ metering_secret }}
-[keystone_authtoken]
-auth_uri = {{ service_protocol }}://{{ service_host }}:{{ service_port }}/
-auth_host = {{ auth_host }}
-auth_port = {{ auth_port }}
-auth_protocol = {{ auth_protocol }}
-admin_tenant_name = {{ admin_tenant_name }}
-admin_user = {{ admin_user }}
-admin_password = {{ admin_password }}
-