Provide RSCT Domain filtering options for managed systems co-managed by HMC and PowerVM NovaLink

In PowerVC environments that utilize IBM Cloud Management Console (CMC) for Power Enterprise Pools (PEP), it's common for managed systems to be co-managed by HMC and PowerVM NovaLink. PowerVM NovaLink is in controller mode to facilitate operations on the managed system via PowerVC and HMC is in co-management mode to allow the CMC to report usage information for Power Enterprise Pools.

Power Enterprise Pools and HMC - https://www.ibm.com/docs/en/power10?topic=pool-using-power-enterprise-pools

PowerVM NovaLink and HMC co-management - https://www.ibm.com/docs/en/power10/9105-42A?topic=environment-powervm-novalink#p10eig_kickoff__title__4

Virtual Machines and NovaLink on a Managed System
Virtual Machines deployed by PowerVC on the managed system establish an RMC connection to PowerVM NovaLink via the dedicated internal virtual network between the Virtual Machine and NovaLink. Most importantly, the Virtual Machine deployed by PowerVC typically does not have access to the HMC, especially in multi-tenant PowerVC environments where the HMC is solely used for hardware management and CMC reporting.

PowerVM NovaLink RMC - https://www.ibm.com/docs/en/power10/9105-42A?topic=novalink-resource-monitoring-control-rmc-powervm

Managed System with NovaLink and HMC Co-Management
In this type of environment, the HMC and PowerVM Novalink must coordinate for co-management mode of the managed system which results in a shared RSTC domain between HMC and NovaLink. This shared domain causes the HMC to be propagated to PowerVM NovaLink managed Virtual Machines even though these Virtual Machines cannot reach the HMC. 

Prevent HMC Information from being propagated to Virtual Machine
This idea proposes an RSCT configuration flag that allows a PowerVM NovaLink operator to filter any domain peers from being propagated to the PowerVM NovaLink managed Virtual Machine via RMC. PowerVC managed Virtual Machines should only ever establish an RMC connection with PowerVM NovaLink.