Description of problem:
lu_name_allowed doesn't allow '.' in user/group names. POSIX states that '.' is
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. lgroupadd joe.schmoe
[root@whiskey root]# lgroupadd joe.schmoe
Group creation failed.
Successful group creation
See bug 159034 for shadow-utils equivalent.
lu_name_allowed() synced with the shadow-utils code in rawhide libuser-0.53.8-1;
RHEL updates will probably use a simpler patch (0.53.8-1 prohibits some
characters that were allowed before).
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