[PAN-2803] Update generate-blockchain-config CLI help

pantheon/src/main/java/tech/pegasys/pantheon/cli/DefaultCommandValues.java

@@ -31,6 +31,7 @@ public interface DefaultCommandValues {
 
   String MANDATORY_PATH_FORMAT_HELP = "<PATH>";
   String MANDATORY_FILE_FORMAT_HELP = "<FILE>";
+  String MANDATORY_DIRECTORY_FORMAT_HELP = "<DIRECTORY>";
   String PANTHEON_HOME_PROPERTY_NAME = "pantheon.home";
   String DEFAULT_DATA_DIR_PATH = "./build/data";
   String MANDATORY_INTEGER_FORMAT_HELP = "<INTEGER>";

pantheon/src/main/java/tech/pegasys/pantheon/cli/operator/OperatorSubCommand.java

@@ -14,6 +14,7 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 import static java.nio.charset.StandardCharsets.UTF_8;
+import static tech.pegasys.pantheon.cli.DefaultCommandValues.MANDATORY_DIRECTORY_FORMAT_HELP;
 import static tech.pegasys.pantheon.cli.DefaultCommandValues.MANDATORY_FILE_FORMAT_HELP;
 import static tech.pegasys.pantheon.cli.DefaultCommandValues.MANDATORY_PATH_FORMAT_HELP;
 import static tech.pegasys.pantheon.cli.operator.OperatorSubCommand.COMMAND_NAME;
@@ -83,7 +84,8 @@ public void run() {
 
   @Command(
       name = "generate-blockchain-config",
-      description = "This command generates blockchain network configuration files.",
+      description =
+          "This command generates node keypairs, genesis file (with RLP encoded IBFT 2.0 extra data).",
       mixinStandardHelpOptions = true)
   static class GenerateNetworkConfigSubCommand implements Runnable {
     @Option(
@@ -97,7 +99,7 @@ static class GenerateNetworkConfigSubCommand implements Runnable {
     @Option(
         required = true,
         names = "--to",
-        paramLabel = MANDATORY_FILE_FORMAT_HELP,
+        paramLabel = MANDATORY_DIRECTORY_FORMAT_HELP,
         description = "Directory to write output files to.",
         arity = "1..1")
     private File outputDirectory = null;

pantheon/src/test/java/tech/pegasys/pantheon/cli/operator/OperatorSubCommandTest.java

@@ -62,9 +62,9 @@ public class OperatorSubCommandTest extends CommandTestAbstract {
           + System.lineSeparator()
           + "Commands:"
           + System.lineSeparator()
-          + "  generate-blockchain-config  This command generates blockchain network"
+          + "  generate-blockchain-config  This command generates node keypairs, genesis"
           + System.lineSeparator()
-          + "                                configuration files.";
+          + "                                file (with RLP encoded IBFT 2.0 extra data).";
 
   private Path tmpOutputDirectoryPath;