Add support for readonly filesystem
Drop debug message
Fix serial console connection (UNIX socket to pseudo terminal)
Rewrite virtio_net (Add support multiple NIC, vhost-net, etc)
Add QEMU default argument for all CPU features emulation
Add support for virtio_blk cache option
Fix problem if virtfs not specified
Add support standard input for QEMU monitor
Add default argument for virtio-balloon
Fix quote
Fix detect whether bridge exists
Simplify default network segment
Fix compliance for QEMU vendor code of MAC address
Fix generate invalid MAC address
Fix address range
Add teadown for virtio_net bridge interface
Fix refactoring virtfs