Added configuration option for "datahost, dataport, metahost, metaport"

Specified as follows:

$QEMU_ROOT/x86_64-softmmu/qemu-system-x86_64 -m 1024 -L pc-bios
-enable-kvm
-cdrom <iso_path>
-drive driver=ldb,datahost=2500,dataport=100,metahost=1500,metaport=120
Added copyright notice
Modified copyright notice