Merge branch '43-increase-test-coverage' into 'develop'

build/ci/.terraform-ci.yml

build/ci/.test.yml

cmd/gnmi-capabilities/capabilities.go

cmd/gnmi-telemetry/telemetry.go

cmd/gosdn/main.go

forks/goarista/gnmi/client.go

nucleus/cli-handling_test.go

nucleus/device_test.go

nucleus/errors.go

nucleus/gnmi_transport.go

nucleus/gnmi_transport_test.go

nucleus/integration_test.go

nucleus/restconf_transport.go

nucleus/restconf_transport_test.go

nucleus/southbound_test.go

nucleus/store_test.go