Add hour options (4, 8, 12, 16) to password expiration presets

[Tspinler]

Summary

Add options for expiring passwords after smaller increments such as 4 hours, 8 hours 12 hours etc. Better yet, allow me to add custom presets to what I need.

Examples

Expires after Presets: 4 hour, 8 hour, 12 hour, Custom

Context

We use passwords that expire after 12 hours.

[droidmonkey]

This seems like a password that is issued to you by a centralized authentication service then. Is that true? If so you wouldn't necessarily want to mark it as expired by every 12 hours just refresh the password given and enter it into that same entry. Either way, you can manually edit the time field in the expired field to set the hours.

[Tspinler]

We use checkout IDs/passwords on a daily basis. Our standard is 12 hour password expiration for most user IDs. It would be useful if there were a preset for 12 hours. I know i can modify the expiration time, but since I do this daily, a preset would be handy.

[schlimmchen]

Related to #4896.