Added daqd_shmem

daqd_shmem is similar to a standiop.  However it reads data from one combined shared memory segment, does not require a timer or adc card.

Updates to the fe_stream_test to put data in the proper places.

Additional test scripts and commands to help manipulate and introspect mbuf memory buffers.
src/drv/mbuf/mbuf_probe
src/zmq_stream/scripts/dump_zmq_core_structs.py

Added a zmq_recv command to receive data from a zmq stream and publish it to a local mbuf.

Adding a new c userspace interface to the mbuf shared memory.

git-svn-id: https://redoubt.ligo-wa.caltech.edu/svn/advLigoRTS/trunk@4650 6dcd42c9-f523-4c6d-aada-af552506706e