[PR #10513/3b551f92 backport][stable-11] arg_spec adjustments: modules [t-z]* (#10535)

arg_spec adjustments: modules [t-z]* (#10513)

* arg_spec adjustments: modules [t-z]*

* add changelog frag

(cherry picked from commit 3b551f92fc)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

plugins/modules/vertica_info.py

@@ -227,9 +227,9 @@ def main():
         argument_spec=dict(
             cluster=dict(default='localhost'),
             port=dict(default='5433'),
-            db=dict(default=None),
+            db=dict(),
             login_user=dict(default='dbadmin'),
-            login_password=dict(default=None, no_log=True),
+            login_password=dict(no_log=True),
         ), supports_check_mode=True)
 
     if not pyodbc_found: