Ticket 50091 - shadowWarning is not generated if passwordWarning is lower than 86400 seconds (1 day)
Bug Description:
For a shadowAccount, if a password policy defines passwordWarning below 1 days (86400 seconds)
then the shadowWarning (in day) is not returned from the entry. In such case its value is '0'.
Fix Description:
The fix is to accept shadowWarning = 0 as valid value and return it
https://pagure.io/389-ds-base/issue/50091
Reviewed by: Mark Reynolds
Platforms tested: F27
Flag Day: no
Doc impact: no