dev-perl/Sys-Virt: Bump to version 3.1.0

dev-perl/Sys-Virt: Bump to version 3.1.0

Upstream:
- Add constants VIR_CONNECT_LIST_STORAGE_POOLS_VSTORAGE,
  VIR_CONNECT_LIST_NODE_DEVICES_CAP_DRM, PERF_PARAM_BRANCH_MISSES,
  PERF_PARAM_BUS_CYCLES, PERF_PARAM_STALLED_CYCLES_FRONTEND,
  PERF_PARAM_STALLED_CYCLES_BACKEND, PERF_PARAM_REF_CPU_CYCLES
- Add virDomainSetVcpu API
- Add group_name for block iotune
- Add new branch instructions for perf event
- Add virStorageVolGetInfoFlags + Constants
- Add domain metadata change event
- Add secret event APIs

Package-Manager: Portage-2.3.4, Repoman-2.3.2