Hello!
I was successful in deciphering the traffic between the client and ovirt-engine, actually, only by dumping the premaster key from the browser, which was generated during the session and providing it to wireshark.

How it can be done for ovirt-engine and vdsm communication? Should the engine private key be provided? Actually to my surprise I don't see any ssl communication between engine and node when for example turn on the virtual machine, only tcp packets. But this page  https://ovirt.org/develop/release-management/features/infra/pki/  states that there should be one. And also should I look for any xml rpc dissector? I know that for example virt-manager uses rpc protocol, I found a dissector for that case, but seems I need another one here.