We now have a single daqd service, and separate services for all the
new front end transport components ({zmq,omx,dix}_{xmit,recv},
local_dc, etc.).

The assumption for all the transport services is that the
/etc/advligorts/env file exists and defines environment variables
specifying the command line arguments for each service, e.g.:

ZMQ_XMIT_ARGS=-e eth0 -s x1tst

The daqd service expects configuration at /etc/advligorts/daqdrc.