[pbs-devel] [PATCH v6 proxmox-backup 13/29] fix #3044: server: implement push support for sync operations

[Christian Ebner]

Acked to the suggestions (not going to address them individually, as 
there is a lot).

Did already adapt most of the suggestions, especially regarding the 
namespace mapping and critical issues such as the missing target 
namespace filtering in the namespace's remove vanished code path.

Also, as discussed offlist, the list_namespace() method in the 
SyncSource trait should be extended to allow for filtering, so that a 
sync job might not leak namespace names if not having the required 
permissions on that namespace.