Add metering_time_to_live and event_time_to_live to ceilometer.conf as a juju option

[Leonardo Borda]

Currently ceilometer.conf template >=Kilo does not contain metering_time_to_live and event_time_to_live parameters. Having these parameters added will help the ceilometer database growth.

The following could be added to the [database] section of ceilometer.conf file as per the openstack documentation.
http://docs.openstack.org/kilo/config-reference/content/section_ceilometer.conf.html

Ideally "juju service set" should be able to deal with setting different values for them.

[database]

#
# From ceilometer
#

# Number of seconds that samples are kept in the database for (<= 0
# means forever). (integer value)
# Deprecated group/name - [database]/time_to_live
#metering_time_to_live = -1

# Number of seconds that events are kept in the database for (<= 0
# means forever). (integer value)
#event_time_to_live = -1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/303040

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/303040
Committed: https://git.openstack.org/cgit/openstack/charm-ceilometer/commit/?id=f3c74cc4c643459038868905e9e26461fdb82f0d
Submitter: Jenkins
Branch: master

commit f3c74cc4c643459038868905e9e26461fdb82f0d
Author: Leonardo Borda <email address hidden>
Date: Thu Apr 7 14:45:06 2016 -0400

    Add metering and event ttl config options

    ceilometer.conf template >= Kilo does not contain metering-time-to-live
    and event-time-to-live parameters. Add these options so we can control
    ceilometer database growth.

    Change-Id: Id5831280daeb582586bfa615268309c4abec5d63
    Closes-Bug: 1561220