Remove gRPC (debug) logging via corteza log facility

If needed, sufficiant logging can be achieved with enviromental variables:
GRPC_GO_LOG_VERBOSITY_LEVEL=99 #
GRPC_GO_LOG_SEVERITY_LEVEL=info # (error, warning, info, fatal)

pkg/app/options/corredor.go

@@ -12,9 +12,6 @@ type (
 		// Also used by corredor service to configure gRPC server
 		Addr string `env:"CORREDOR_ADDR"`
 
-		// Also used by corredor service to enable logging
-		Log bool `env:"CORREDOR_LOG_ENABLED"`
-
 		MaxBackoffDelay time.Duration `env:"CORREDOR_MAX_BACKOFF_DELAY"`
 
 		MaxReceiveMessageSize int `env:"CORREDOR_MAX_RECEIVE_MESSAGE_SIZE"`
@@ -46,7 +43,6 @@ func Corredor() (o *CorredorOpt) {
 		DefaultExecTimeout:    time.Minute,
 		ListTimeout:           time.Second * 2,
 		ListRefresh:           time.Second * 5,
-		Log:                   false,
 
 		TlsCertEnabled: false,
 		TlsCertPath:    "/certs/corredor/client",

pkg/corredor/conn.go

@@ -8,14 +8,11 @@ import (
 	"io/ioutil"
 	"os"
 
+	"github.com/cortezaproject/corteza-server/pkg/app/options"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
-	"go.uber.org/zap/zapgrpc"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/grpclog"
-
-	"github.com/cortezaproject/corteza-server/pkg/app/options"
 )
 
 // Corredor standard connector to Corredor service via gRPC
@@ -28,13 +25,6 @@ func NewConnection(ctx context.Context, opt options.CorredorOpt, logger *zap.Log
 		return
 	}
 
-	if opt.Log {
-		// Send logs to zap
-		//
-		// waiting for https://github.com/uber-go/zap/pull/538
-		grpclog.SetLogger(zapgrpc.NewLogger(logger.Named("grpc")))
-	}
-
 	var (
 		dialOpts = make([]grpc.DialOption, 0)
 

pkg/corredor/conn_test.go

@@ -42,7 +42,6 @@ func TestNewConnection(t *testing.T) {
 
 		opt = options.CorredorOpt{
 			Enabled:         true,
-			Log:             testing.Verbose(),
 			MaxBackoffDelay: 1,
 			Addr:            lstnr.Addr().String(),
 		}