The groupadd from shadow does not allow upper case group names, the
same is true for the upstream shadow. But distributions like
Debian/Ubuntu/CentOS has their own way to cope with this problem,
this patch is picked up from CentOS release 7.0 to relax the usernames
restrictions to allow the upper case group names, and the relaxation is
POSIX compliant because POSIX indicate that usernames are composed of
characters from the portable filename character set [A-Za-z0-9._-].
Signed-off-by: Shan Hai <shan.hai@windriver.com> Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
