Instructions for migrating to provisioner-harvest-mode are wrong

[Adam Collard]

Using juju with the old style provisioner-safe-mode emits a warning message suggesting to migrate to provisioner-harvest-mode but directs the user badly.

⟫ juju bootstrap
WARNING Config attribute "provisioner-safe-mode" (true) is deprecated.
It is replaced by "provisioner-harvest-mode" attribute.
Your configuration should be updated to set "provisioner-harvest-mode" as follows
provisioner-harvest-mode: true.
Bootstrapping environment "beretstack"
Bootstrap failed, destroying environment
⟫ juju bootstrap --upload-tools
Bootstrap failed, cleaning up the environment.
ERROR there was an issue examining the environment: provisioner-harvest-mode: expected string, got bool(false)
⟫ juju bootstrap --upload-tools
Bootstrap failed, cleaning up the environment.
ERROR there was an issue examining the environment: provisioner-harvest-mode: expected string, got bool(true)
⟫ juju bootstrap --upload-tools
Bootstrap failed, cleaning up the environment.
ERROR there was an issue examining the environment: unknown harvesting method: false

Note I ended up using "none" as the setting which seems the correct migration from provisioner-safe-mode: true.

[Ian Booth (wallyworld)]

If safe mode is true, then harvest mode "destroyed" will be used. There was a typo in the warning message which will be fixed.