agent: Add support to online vCPUs
agent: Add support to online vCPUs

this patch is to online vCPU in the POD when a new vCPU is
hot added by the runtime

fixes #189

Signed-off-by: Julio Montes <4a43a13347431ef00be7d745d08a5ba1757e840b@intel.com>

clearcontainers/agent,clearcontainers/agent