Add vz statistics for network, cpu and memory.
src/vz/vz_driver.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++-
src/vz/vz_sdk.c | 69 ++++++++++++++++++++++++++-
src/vz/vz_sdk.h | 4 ++
Changes from v1.
subject prefix changed from 'parallels' to 'vz'