[sma_astro] Removed the set_dtrip command which is never used.

The functionality of this has been replaced by DSM.
[sma_astro] Removed the set/get delay/phase commands.

This functionality has now been taken over by DSM reads in the
update_vars function which is called in the fstop thread.
[tbs_plugins/sma_dsm_wait] Added a DSM waiting plugin; presently for updating integration time.