No-discovery backend works in discovery mode.

Backend put in place, has old mode with discovery and new mode without one. The old mode works as usual, going to add a new mode.
No-discovery backend works.

When supplied with flag --cad CAD, master and slaves will read CAD file into list of peers instead of attempting a discovery.

This removes delay at start.

Also it requires that all IP addresses and PORTs in CAD file and on the command line to be textually equal one to another.

E.g., you cannot specify --ip localhost and write into CAD file line with 127.0.0.1.

Please bear this constraint in mind.
Merge branch 'master' of github.com:SKA-ScienceDataProcessor/RC