Ive just tried to install the release version of Plesk Onyx and when I do a "vzpkg update cache centos-7-x86_64" I get:
# vzpkg update cache centos-7-x86_64
Update OS template cache for centos-7-x86_64 template
Loaded plugins: rpm2vzrpm
Cleaning repos: pp-nginx0
0 metadata files removed
0...