Failed provisioning error should be more informative (Azure provider)

[Haw Loeung]

Hi,

When units fail provisioning, all we see is this:

| Machine State DNS Inst id Series AZ Message
| 6 down 52.230.xxx.xxx machine-6 xenial Failed

"Failed" isn't really helpful. Perhaps we could include the real error such as "Different basic sku and standard sku load balancer or public Ip resources in..." per LP: #1824465.

[Haw Loeung (hloeung)]

FWIW, even 'juju status --format=yaml' doesn't provide much information as to why it failed:

| "6":
| juju-status:
| current: down
| message: agent is not communicating with the server
| since: 12 Apr 2019 02:07:17Z
| dns-name: 52.230.xxx.xxx
| ip-addresses:
| - 52.230.xxx.xxx
| - 192.168.0.10
| instance-id: machine-6
| machine-status:
| current: provisioning error
| message: Failed
| since: 12 Apr 2019 02:07:17Z
| modification-status:
| current: idle
| since: 12 Apr 2019 02:06:40Z
| series: xenial
| constraints: instance-type=Standard_D2_v2
| hardware: arch=amd64 cores=2 mem=7168M root-disk=30720M

[Canonical Juju QA Bot (juju-qa-bot)]

This bug has not been updated in 2 years, so we're marking it Low importance. If you believe this is incorrect, please update the importance.