[evlatests] EVLA Antenna Stowing

[Ken Sowinski]

> We've been told that the EVLA antennas do not autostow when not 
> receiving commands 

I know no reason why they should not autostow once a script
runs out and the executor exits.  It may take a little longer
because first the ACU MIB must realize it is not getting commands
before it stops sending instruction to the ACU so that it may
timeout.  Certainly I have seen it happen.

> and have asked the operators to park/stow the 
> antennas manually after a test is complete. We do this by either 
> commanding the antenna to the correct az/el (az is different for each 
> arm) or issuing Barry's command:
> 
> /home/asg/.maven/repository/nrao/bin/stow evlaparm "ea14 ea16"

I normally do one of these when finished as well.
 
> JC had a good suggestion - what if obs2script added a final scan to put 
> the antenna into park or stow? What do you think?

What happens when we begin running sequential scripts?  I vote
for leaving the operational model as it is to avoid confusion,
especially as the EVLA antennas are used more routinely.  Only
the operator causes antennas to point or stow; only scripts tell
the antennas where to point.