[#1441] cli: Use grpc.WaitForReady while initializing SDK client

Before, when the target RPC server was unavailable, requests made
by CLI didn't wait for a timeout specified by the `--timeout` option
if the timeout was more than 20 seconds. It's because of the gRPC
default backoff strategy. Adding this option fixes that behavior.

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

cmd/frostfs-cli/internal/client/sdk.go

@@ -58,6 +58,7 @@ func GetSDKClient(ctx context.Context, cmd *cobra.Command, key *ecdsa.PrivateKey
 		GRPCDialOptions: []grpc.DialOption{
 			grpc.WithChainUnaryInterceptor(tracing.NewUnaryClientInteceptor()),
 			grpc.WithChainStreamInterceptor(tracing.NewStreamClientInterceptor()),
+			grpc.WithDefaultCallOptions(grpc.WaitForReady(true)),
 		},
 	}
 	if timeout := viper.GetDuration(commonflags.Timeout); timeout > 0 {

cmd/frostfs-cli/modules/tree/client.go

@@ -34,6 +34,7 @@ func _client() (tree.TreeServiceClient, error) {
 			metrics.NewStreamClientInterceptor(),
 			tracing.NewStreamClientInterceptor(),
 		),
+		grpc.WithDefaultCallOptions(grpc.WaitForReady(true)),
 	}
 
 	if !strings.HasPrefix(netAddr.URIAddr(), "grpcs:") {