Modified spec file to work properly with openSuSE 12.3 and above.
openSuse changed their password and group utilities as of 12.3 to be
more in line with other redhat variants.   The package name also changed
from 'pwdutils' to 'shadow'.
Updated to be smarter about when to include different SuSE packages.
Original commit would have added 'shadow' as a package requirement for
non SuSe servers.
Merge pull request #38 from mfrost8/master

Modified spec file to work properly with openSuSE 12.3 and above.