(#7485) Support zypper 0.6 with zypper package provider

Replaced code that was erroneously assumed to be equivalent with a
more verbose version that works on all Suse systems.

Tested on:
SLE 10.2, 11.0, 11.1
OpenSuSE 10.2, 10.3, 11.1, 11.2, 11.3, 11.4