virtual-guest: Decrease the swappiness

[Red54]

vm.swappiness of throughput-performance is 10, so set vm.swappiness of virtual-guest to 5.

RHEL 7: Virtualization Tuning and Optimization Guide: Chapter 4. tuned and tuned-adm:

Based on the throughput-performance profile, virtual-guest also decreases the swappiness of virtual memory.

RHEL 8: Configuring and managing virtualization: Chapter 16. Optimizing virtual machine performance:

For RHEL 8 virtual machines, use the virtual-guest profile. It is based on the generally applicable throughput-performance profile, but also decreases the swappiness of virtual memory.

RHEL 9: Configuring and managing virtualization: Chapter 17. Optimizing virtual machine performance:

For RHEL 9 virtual machines, use the virtual-guest profile. It is based on the generally applicable throughput-performance profile, but also decreases the swappiness of virtual memory.

[yarda]

Thanks for the contribution and sorry for the delay. Do you have some benchmark data supporting this change? It's apparent that this needs a fix, but it could be also fixed in the documentation.