fix(client): Update log messages when unregistered

[pkoprda]

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Complete Description of Additions/Changes:

• Card ID: CCT-265

This patch updates the logging messages shown to the user when the host is not registered with subscription-manager or when the host is not registered with insights-client.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.85185% with 13 lines in your changes missing coverage. Please review.

Project coverage is 77.63%. Comparing base (8f6ee99) to head (b7c8524).

Files with missing lines	Patch %	Lines
insights/client/phase/v1.py	64.70%	3 Missing and 3 partials ⚠️
insights/client/connection.py	37.50%	5 Missing ⚠️
insights/client/__init__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4421      +/-   ##
==========================================
- Coverage   77.63%   77.63%   -0.01%     
==========================================
  Files         745      745              
  Lines       41623    41631       +8     
  Branches     6675     6678       +3     
==========================================
+ Hits        32313    32319       +6     
- Misses       8276     8278       +2     
  Partials     1034     1034              

Flag	Coverage Δ
unittests	77.61% <51.85%> (-0.01%)	⬇️

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[m-horky]

When not registered,

cat .../insights-client/integration-tests/playbook_verifier/playbooks/bugs.yml | insights-client -m insights.client.apps.ansible.playbook_verifier

displays the new message; instead, the Verifier should have been run.

---

We might have problems with the new wording of the message.

# legacy
System is NOT registered locally via .registered file.
# non-legacy
This host is unregistered.
# PR
This host has not yet been registered, [...]

Various integrations parse insights-client output, as the exit codes haven't been consistent before. rhc wouldn't affected, but the rhc system role would:

https://github.com/linux-system-roles/rhc/blob/41fd39f1741e8ce3ac3405662194ecd631d24e2b/tasks/insights-client.yml#L136-L144

Can you change the wording so it matches whatever is searched for in the role? We've since made the behavior consistent, and when not registered we always return non-zero code, but the role is ignoring that.

I think we should try to run the collection's tests before merging this.

[zpetrace]

Verification PASSED from the QE side, let's wait for a DEV ack and then we can merge:)