fix: treat releasever <=7 x.y as xServer

[pindo696]

Reproduced on a RHEL 7.9 VM: yum repolist looked the same for 7.9 and after subscription-manager release --set=7Server (and checking redhat.repo). Vulnerability report did not. With rhsm_version=7.9 we got different number of CVEs reported. Same host, different releasever only.

That’s because vmaas filters repos by releasever. So 7.9 and 7Server hit different repo sets - which is intentional as strict matching and caused by setting subscription-manager release --set=7.9 which is a user preference setup.
RHEL 7 has the dual 7.9 and 7Server naming that looks like that yum treats as equivalent. This hotfix does the same in vmaas-lib: alias {x}.{y} -> {x}Server before matching. We don’t see this on RHEL 8+ since releasevers are numeric and already match what is being stored (RHEL 8+ uses {major}.{minor}.)

I was unable to reproduce on RHEL 6 as it was unable to register the machine with entitlement server.

TLDR: Alias {x}.{y} -> {x}Server for x <= 7 before existing releasever matching in vmaas-lib (passReleasever / repos2IDs).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.84%. Comparing base (b64c496) to head (cc88d2e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
vmaas/vulnerabilities.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   70.72%   70.84%   +0.12%     
==========================================
  Files          30       30              
  Lines        2842     2854      +12     
==========================================
+ Hits         2010     2022      +12     
  Misses        722      722              
  Partials      110      110              

Flag	Coverage Δ
unittests	70.84% <86.66%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.