feat(client): Get list of reports for system in more efficient way

[pkoprda]

All Pull Requests:

Check all that apply:

• [x] Have you followed the guidelines in our Contributing document, including the instructions about commit messages?
• [x] No Sensitive Data in this change?
• [ ] Is this PR to correct an issue?
• [x] Is this PR an enhancement?

Complete Description of Additions/Changes:

• Card ID: CCT-1082

To reduce the ammount of requests on Advisor API endpoint, checking for the latest results for a single host will happen only when there are some hits for that host. Also the permissions for /var/lib/insights were adjusted to 0o750 to align with the insights-client spec file.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 9.52381% with 19 lines in your changes missing coverage. Please review.

Project coverage is 77.63%. Comparing base (1f49b61) to head (84ca637).

Files with missing lines	Patch %	Lines
insights/client/connection.py	6.25%	15 Missing :warning:
insights/client/__init__.py	20.00%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4459      +/-   ##
==========================================
- Coverage   77.64%   77.63%   -0.01%     
==========================================
  Files         745      745              
  Lines       41669    41676       +7     
  Branches     6696     6700       +4     
==========================================
+ Hits        32354    32356       +2     
- Misses       8285     8290       +5     
  Partials     1030     1030              

Flag	Coverage Δ
unittests	77.62% <9.52%> (-0.01%)	:arrow_down:

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

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

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

[zpetrace]

Preliminary testing passed so everything looks fine from the QE side, verification comment has been left in the corresponding CCT card.

[pkoprda]

@xiangce we can merge this

[xiangce]

Let's ignore the failed puptoo test in compatibility test this time. It's caused by this change to puptoo which requires some changes when preparing the venv for unit-test. Per my local test, this PR won't break the unit-test.