Add the ability to expire passwords after a configurable number of days (#19458).

Patch by Holger Just and Go MAEDA.

git-svn-id: http://svn.redmine.org/redmine/trunk@14264 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/settings.yml

@@ -36,6 +36,10 @@ unsubscribe:
 password_min_length:
   format: int
   default: 8
+# Maximum password age in days
+password_max_age:
+  format: int
+  default: 0
 # Maximum number of additional email addresses per user
 max_additional_emails:
   format: int