Add libzypp-plugin-appdata, gcap, appstream-glib to the SUSE Package Hub

This update adds libzypp-plugin-appdata, gcap, appstream-glib to the SUSE Package Hub.

libzypp-plugin-appdata extends libzypp to handle AppStream metadata.
The packages are run-time dependencies for discover. (bsc#1051519)

Fixed bugs
bnc#1051519
package discover is missing runtime dependency libzypp-plugin-appdata
Selected Binaries
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