[stabilization] Fix pwquality_path for SLE16 - #14749

Following properties got different values in the sle16 product:
 - pwquality_path from '/usr/lib/security/pwquality.conf' -> '/etc/security/pwquality.conf'
If changes to mentioned products are intentional, execute this script with PYTHONPATH set to the project root to regenerate reference products: 
/__w/content/content/tests/test_product_stability.py --update-reference-data /__w/content/content/products /__w/content/content/tests/data/product_stability
If those changes are unwanted, take a look at product properties that likely cause these changes.