cmd: status and cloud-id avoid change in behavior for 'not run'

[blackboxsw]

We don't want to break existing snapd. So, let's leave "not run" value untouched. Also note, if we decide to change cloud-init status exit codes, that also has the potential to break snapd too, so we'd need to float that by that team first and get buyin.

Proposed Commit Message

snapd currrently looks for 'not run' from cloud-init status[1].
Avoid changing this behavior and revert "not-run" value to
"not run".

This avoids having to get snapd to change implementation and
release updates as far back as Bionic to handle a hyphenated
not-run string.

[1]: https://github.com/snapcore/snapd/blob/master/sysconfig/\
     cloudinit.go#L802

Additional Context

Test Steps

Checklist:

• My code follows the process laid out in the documentation
• I have updated or added any unit tests accordingly
• I have updated or added any documentation accordingly

[TheRealFalcon]

+1 assuming CI passes