add option to export-bundle that shows all config options

[James Troup]

Please add an option to the export-bundle command which documents all config values, i.e. including defaults. This would be very useful for sanity checking tools (such as juju-lint).

[Ian Booth (wallyworld)]

There's now a --include-charm-defaults option to juju export-bundle

https://github.com/juju/juju/pull/12985

So for a mariadb deploy with query-cache-size set to 10000 and dataset-size = 50%

$ juju export-bundle
applications:
  mariadb:
    charm: cs:trusty/mariadb-7
    channel: stable
    series: trusty
    num_units: 1
    to:
    - "0"
    options:
      dataset-size: 50%
      query-cache-size: 10000
    constraints: arch=amd64

$ juju export-bundle --include-charm-defaults
applications:
  mariadb:
    charm: cs:trusty/mariadb-7
    channel: stable
    series: trusty
    num_units: 1
    to:
    - "0"
    options:
      base-url: https://downloads.mariadb.com/enterprise
      base-url-org: http://ftp.osuosl.org/pub/mariadb/repo
      binlog-format: MIXED
      block-size: 5
      ceph-osd-replication-count: 2
      dataset-size: 50%
      enterprise-eula: false
      ha-bindiface: eth0
      ha-mcastport: 5411
      key: "0xce1a3dd5e3c94f49"
      key-org: 0xcbcb082a1bb943db 0xF1656F24C74CD1D8
      max-connections: -1
      preferred-storage-engine: InnoDB
      query-cache-size: 10000
      query-cache-type: "OFF"
      rbd-name: mysql1
      repo-pkg: mariadb-enterprise-repository.deb
      series: "10.1"
      token: ""
      tuning-level: safest
      vip: ""
      vip_cidr: 24
      vip_iface: eth0
    constraints: arch=amd64