Move the parsing of a filedescriptor into a common function
qemu_parse_fd() so others can use it as well. Have net.c call this
function.

v2:
 - moving qemu_parse_fd into cutils.c
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>