Issue 50873 - Fix issues with healthcheck tool
Description:
Created sanity HealthCheck test to see if the tool works on standalone instance.
I extended topology_st with LogCapture in src/lib389/lib389/topologies.py
and added new topology_no_sample that does not create sample entries so we can reproduce DSBLE0003.
Added environment variable PYINSTALL to use python installer for these tests.
The tests can be run using 'PYINSTALL=True py.test ...'.
Also created test to check DSBLE0003 and added test steps from Sylvie (Thanks!) because
we want to import them to our test plan in Polarion
I will fill the blank tests soon.
Relates: https://pagure.io/389-ds-base/issue/50873
Reviewed by: spichugi, firstyear, vashirov (Thanks!)