A few fixes to zvrboot when running under ESX
A few fixes to zvrboot when running under ESX

1. Wait virtio port iff. on KVM hypervisor
2. Unmarshal the bootstrap info for further processing

Signed-off-by: David Lee <15c338f3b79a63a0d5423e9c6562cd312918fe74@gmail.com>

zstackorg/zstack-vyos,zstackorg/zstack-vyos,zstackorg/zstack-vyos