update to go 1.17 (#167)

* chore: update to go 1.17

* fix: update workflows go version

* fix: golint errors/update grpc

management/server/management_test.go

@@ -3,6 +3,7 @@ package server_test
 import (
 	"context"
 	server "github.com/wiretrustee/wiretrustee/management/server"
+	"google.golang.org/grpc/credentials/insecure"
 	"io/ioutil"
 	"math/rand"
 	"net"
@@ -472,7 +473,9 @@ func loginPeerWithValidSetupKey(serverPubKey wgtypes.Key, key wgtypes.Key, clien
 func createRawClient(addr string) (mgmtProto.ManagementServiceClient, *grpc.ClientConn) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
-	conn, err := grpc.DialContext(ctx, addr, grpc.WithInsecure(),
+
+	conn, err := grpc.DialContext(ctx, addr,
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
 		grpc.WithBlock(),
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time:    10 * time.Second,