[Dev] Discovery Job

[Leo Bayer]

Brett (et al),

I'm creating a server job for discovery so that we can have a singleton 
schedulable discovery job.  As a side effect this means there will no 
longer be a need for the Discovery Provider.  I'm going to change the 
client to use create a job for interactive discovery.

 From an API standpoint, does it make sense to drop the Discovery 
provider as it will no longer be used?  I know there is one example 
script for ZipTie::Client that uses that provider that would presumably 
be changed to create a job.  Do we need to worry about integrations, or 
is it better to say that this particular provider is no longer supported?

 - Leo