Resolve "PND handling via CLI and database"

added 17 commits

f399296f - changed gosdnCLI proto to be able to add PNDs
2b98e54a - some small PND changes
5c920a6f - pnds can be stored and loaded via gub
1bfe01d6 - updated southbound and nucleus/controller
c1242e9f - updated proto for devices
4d84a0b3 - changes to support sending and saving devices
6edec9e7 - Merge branch '67-overhaul-architecture' of ssh://code.fbi.h-da.de/cocsn/gosdn...
3b086065 - Merge branch '67-overhaul-architecture' of ssh://code.fbi.h-da.de/cocsn/gosdn...
cbc0d7a6 - small cli-handling changes
bbd295f7 - Merge branch '67-overhaul-architecture' of ssh://code.fbi.h-da.de/cocsn/gosdn...
e22181ad - Merge branch '67-overhaul-architecture' of ssh://code.fbi.h-da.de/cocsn/gosdn...
51b7cdab - added all necessary grpc proto for the updated gosdnc
cfe4a3b2 - removed gob for persisting and changed:
1a8c30d4 - it is possible to backup pnds into a json file
b2efd44b - added functionality to load backup.json for pnd
28b0f2c9 - added functions to retrieve instances of sbis
746f7102 - clean up

requested review from @fbi1478

assigned to @fbi1478 and @istmabauc

mentioned in merge request !76 (closed)

added 19 commits

746f7102...62af76aa - 12 commits from branch 67-overhaul-architecture
ffc3fc3b - Merge branch '67-overhaul-architecture' into 63-pnd-handling-via-cli-and-database-2
0060a016 - adjustments for the last merge
e0fae3f7 - Merge branch '67-overhaul-architecture' into 63-pnd-handling-via-cli-and-database-2
57b8bb9e - device is now filled after a GET request
730bdec6 - removed unnecessary logs
be368991 - added GoStruct in Device creation in:
5e187d37 - adapted the testcase blueprints