Merge branch 'develop' into 'master'

log/logger.go

log/loglevel.go

main.go

mocks/ConfigCallback.go

mocks/EscapeFunc.go

mocks/GNMIClient.go

mocks/GNMIServer.go

mocks/GNMI_SubscribeClient.go

mocks/GNMI_SubscribeServer.go

mocks/JSONUnmarshaler.go

mocks/PrincipalNetworkDomain.go

mocks/PublishFunc.go

mocks/SBIGreeter.go

mocks/SouthboundInterface.go

mocks/Storable.go

mocks/Transport.go

mocks/TransportOptions.go

mocks/isSubscribeRequest_Request.go

mocks/isSubscribeResponse_Response.go

mocks/isTypedValue_Value.go