fix unbound variable reference

parse_daemon_config references zerovm_network_type, but it isn't set
yet.  this moves the config load of zerovm_network_type before
parse_daemon_config for less stack dumpage.
Fix opaque descriptor

opaque descriptor (for zbroker, anyway) is
"<broker_name>|<direction><pipe_name>", with direction being either ''
for read, or '>' for write.  update to match this format.