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!)