Check for postgresql-client package in postgresql test

tests/scripts/test_postgresql.py

@@ -389,7 +389,7 @@ def main():
     """Run all checks and exits with corresponding exit code."""
 
     apt = Apt()
-    if "postgresql" not in apt.installed_packages:
+    if "postgresql-client" not in apt.installed_packages:
         exit(2)
 
     # load configuration