Update login.defs on openSUSE
Update login.defs on openSUSE

Some of the tripleo image elements rely useradd a for creating a group
with the same name as the user that is added. On openSUSE is feature
is turned off by default. So enable it here.

Change-Id: I120067e5e522dc6e704e7f09b724d60dee0c7f22

zioproto/diskimage-builder,varunarya10/diskimage-builder,openstack/diskimage-builder,varunarya10/diskimage-builder,rdo-management/diskimage-builder,NaohiroTamura/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,zioproto/diskimage-builder,citrix-openstack-build/diskimage-builder,eantyshev/diskimage-builder,citrix-openstack-build/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,rdo-management/diskimage-builder,takahashinobuyuki/diskimage-builder,switch-ch/diskimage-builder,openstack/diskimage-builder,JioCloud/diskimage-builder,JioCloud/diskimage-builder,eantyshev/diskimage-builder,NaohiroTamura/diskimage-builder,switch-ch/diskimage-builder,takahashinobuyuki/diskimage-builder