Comment # 1 on bug 1166680 from Thorsten Kukuk

If you did take care about *.rpmsave and *.rpmnew files as documented
everywhere, you don't need symlinks breaking your system later.
Beside that, aaa_base should adjust /etc/nsswitch.conf, did you apply all
updates (zypper dup) and what does the log says about your aaa_base update?