Merge branch 'master-into-develop2' into 'master'

mocks/GNMIServer.go

mocks/GNMI_SubscribeClient.go

mocks/GNMI_SubscribeServer.go

mocks/JSONUnmarshaler.go

mocks/NetworkDomain.go

mocks/PublishFunc.go

mocks/SBIGreeter.go

mocks/SouthboundInterface.go

mocks/Storable.go

mocks/Store.go

mocks/Transport.go

mocks/TransportOptions.go

mocks/UnsafeGNMIServer.go

mocks/isSubscribeRequest_Request.go

mocks/isSubscribeResponse_Response.go

mocks/isTypedValue_Value.go

northbound/client/core.go

northbound/client/pnd.go

northbound/server/core.go

northbound/server/core_test.go