Improve GPG key import and repository-related messages

[bocekm]

Repositories should not be abbreviated to "repos" in user facing messages.

The GPG key message was mentioning "keys" being imported while it referred to a single key.

[codecov]

Codecov Report

Merging #547 (8114672) into main (03e9700) will not change coverage.
The diff coverage is 60.00%.

@@           Coverage Diff           @@
##             main     #547   +/-   ##
=======================================
  Coverage   87.67%   87.67%           
=======================================
  Files          17       17           
  Lines        2458     2458           
  Branches      425      425           
=======================================
  Hits         2155     2155           
  Misses        241      241           
  Partials       62       62           

Impacted Files	Coverage Δ
convert2rhel/checks.py	95.70% <ø> (ø)
convert2rhel/pkghandler.py	91.85% <50.00%> (ø)
convert2rhel/subscription.py	87.76% <50.00%> (ø)
convert2rhel/systeminfo.py	95.36% <100.00%> (ø)

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[r0x0d]

Looks good to me. The only thing is that codecov is pointing out that some lines are not covered by unit_tests. Would like to make them right now, or tackle this in another PR?

For me, I would say it's not something critical, and we can merge it.

[abadger]

I agree with @r0x0d that since the lines are presently not covered and the code inside is just to log messages when certain conditions are true that we don't have to add new unittests for those cases in this PR. Merging.