openrc: Need for more robust parsing of `juju status` output

[Frode Nordahl]

Juju 2.5 adds listing of `storage` and `volumes` to `juju status` output, this means that in some situations our primitive AWK processing of the YAML is not sufficient.

Example scenario:
ubuntu@test:~$ juju status keystone --format yaml
model:
  name: default
  type: iaas
  controller: fnordahl-serverstack
  cloud: serverstack
  region: serverstack
  version: 2.5-rc2
  model-status:
    current: available
    since: 09 Jan 2019 10:59:26Z
  sla: unsupported
machines:
  "8":
    juju-status:
      current: started
      since: 09 Jan 2019 15:18:44Z
      version: 2.5-rc2
    dns-name: 10.5.0.20
    ip-addresses:
    - 10.5.0.20
    - 252.0.20.1
    instance-id: b77add10-7965-4eb8-9d60-172a0c285412
    machine-status:
      current: running
      message: ACTIVE
      since: 09 Jan 2019 15:13:24Z
    series: bionic
    network-interfaces:
      ens3:
        ip-addresses:
        - 10.5.0.20
        mac-address: fa:16:3e:eb:cf:f4
        gateway: 10.5.0.1
        is-up: true
      fan-252:
        ip-addresses:
        - 252.0.20.1
        mac-address: 32:bd:f4:83:bf:30
        is-up: true
    constraints: virt-type=kvm
    hardware: arch=amd64 cores=2 mem=1536M root-disk=15360M availability-zone=nova
applications:
  keystone:
    charm: cs:~openstack-charmers-next/keystone-401
    series: bionic
    os: ubuntu
    charm-origin: jujucharms
    charm-name: keystone
    charm-rev: 401
    can-upgrade-to: cs:~openstack-charmers-next/keystone-403
    exposed: false
    application-status:
      current: active
      message: Unit is ready
      since: 09 Jan 2019 15:25:39Z
    relations:
      cluster:
      - keystone
      identity-credentials:
      - ceilometer
      identity-service:
      - gnocchi
      shared-db:
      - percona-cluster
    units:
      keystone/0:
        workload-status:
          current: active
          message: Unit is ready
          since: 09 Jan 2019 15:25:39Z
        juju-status:
          current: idle
          since: 14 Jan 2019 15:05:06Z
          version: 2.5-rc2
        leader: true
        machine: "8"
        open-ports:
        - 5000/tcp
        public-address: 10.5.0.20
    version: 13.0.2
    endpoint-bindings:
      admin: ""
      certificates: ""
      cluster: ""
      domain-backend: ""
      ha: ""
      identity-admin: ""
      identity-credentials: ""
      identity-notifications: ""
      identity-service: ""
      internal: ""
      keystone-fid-service-provider: ""
      nrpe-external-master: ""
      public: ""
      shared-db: ""
      websso-trusted-dashboard: ""
storage:
  storage:
    osd-devices/0:
      kind: block
      life: alive
      status:
        current: attached
        since: 09 Jan 2019 15:13:21Z
      persistent: true
      attachments:
        units:
          ceph-osd/0:
            machine: "4"
            location: /dev/vdd
            life: alive
    osd-devices/1:
      kind: block
      life: alive
      status:
        current: attached
        since: 09 Jan 2019 15:13:21Z
      persistent: true
      attachments:
        units:
          ceph-osd/1:
            machine: "5"
            location: /dev/vdd
            life: alive
    osd-devices/2:
      kind: block
      life: alive
      status:
        current: attached
        since: 09 Jan 2019 15:13:19Z
      persistent: true
      attachments:
        units:
          ceph-osd/2:
            machine: "6"
            location: /dev/vdd
            life: alive
  volumes:
    "0":
      provider-id: 0d946edd-cdee-48df-b315-65cf091762fa
      storage: osd-devices/0
      attachments:
        machines:
          "4":
            device: vdd
            read-only: false
            life: alive
        units:
          ceph-osd/0:
            machine: "4"
            location: /dev/vdd
            life: alive
      pool: cinder
      size: 10240
      persistent: true
      life: alive
      status:
        current: attached
        since: 09 Jan 2019 15:13:21Z
    "1":
      provider-id: 6d5ad12f-88af-4e8d-831d-25c9cee343e7
      storage: osd-devices/1
      attachments:
        machines:
          "5":
            device: vdd
            read-only: false
            life: alive
        units:
          ceph-osd/1:
            machine: "5"
            location: /dev/vdd
            life: alive
      pool: cinder
      size: 10240
      persistent: true
      life: alive
      status:
        current: attached
        since: 09 Jan 2019 15:13:21Z
    "2":
      provider-id: 59b1c25a-4417-4c52-9be5-3684cc74806e
      storage: osd-devices/2
      attachments:
        machines:
          "6":
            device: vdd
            read-only: false
            life: alive
        units:
          ceph-osd/2:
            machine: "6"
            location: /dev/vdd
            life: alive
      pool: cinder
      size: 10240
      persistent: true
      life: alive
      status:
        current: attached
        since: 09 Jan 2019 15:13:19Z
controller:
  timestamp: 15:08:20Z
ubuntu@test:~$ source src/openstack-charm-testing/rcs/openrc
-bash: [: too many arguments
Using Keystone v2.0 API
/tmp/juju-exec254394858/script.sh: line 1: ceph-osd/0: No such file or directory
/tmp/juju-exec962800830/script.sh: line 1: ceph-osd/0: No such file or directory

[Frode Nordahl (fnordahl)]

https://github.com/openstack-charmers/openstack-charm-testing/pull/39