Revert "Dom0: use kpackagekit for updates GUI"

This reverts commit 94c0f6c9d3.

Kpackagekit is not so nice-behaving as gpk-update-viewer is,
e.g. it complains there are is no network connectivity, and, perhaps
as a result, doesn't display the list of avilable updates.

dom0/aux-tools/qubes-watch-updates.sh

@@ -52,7 +52,7 @@ while true; do
                 # Yes, I know that it will block future checking for updates,
                 # but it is intentional (to not flood user with updates
                 # notification)
-                kpackagekit --updates
+                gpk-update-viewer
             fi
         fi
     done

dom0/qvm-tools/qvm-dom0-upgrade

@@ -19,7 +19,7 @@ if [ $# -gt 0 ]; then
 elif [ -f /var/lib/qubes/updates/repodata/repomd.xml ]; then
     yum check-update
     if [ $? -eq 100 ]; then
-        kpackagekit --updates
+        gpk-update-viewer
     fi
 else
     echo "No updates avaliable"

rpm_spec/core-dom0.spec

@@ -42,7 +42,6 @@ Conflicts:      qubes-gui-dom0 < 1.1.13
 Requires:       yum-plugin-post-transaction-actions
 Requires:       xen >= 4.1.0-2
 Requires:       createrepo
-Requires:       kpackagekit
 %define _builddir %(pwd)/dom0
 
 %description