Description of problem:
If the account expiration value is set to zero, the account is set to
expire zero days after the epoch ie 01/01/70, which effectively
disables the account. However, chage -l lists values <=0 as 'Never'.

Version-Release number of selected component (if applicable):
shadow-utils-4.0.3-6

How reproducible:
Every time

Steps to Reproduce:
1.chage -l foo    //will show user foo's expire date as 'Never'
2.chage -E0 foo   
3.chage -l foo    //still 'Never'
4.su - foo        //'Account Expired' message
  
Actual results:
'chage -l' shows 'Never', even though the account is expired

Expected results:
Should show account expiration date of 01/01/1970

Additional info:
'chage -E1 foo ; chage -l foo' produces the expected results
(01/02/1970, in this case)