message: [management] rename storage helper commands to match reality
  Realistically, the arg parser doesn't care what the name of the binary
  is in any of the commands, but it does need one.  This will update it to
  look like the real thing.
  Closes:
  Approved by: davidiw
diff: @@ -69,7 +69,7 @@ impl StorageHelper {
  ) -> Result<Ed25519PublicKey, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  libra-root-key
  --validator-backend backend={backend};\
  path={path};\
  @@ -91,7 +91,7 @@ impl StorageHelper {
  pub fn create_waypoint(&self, validator_ns: &str) -> Result<Waypoint, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  create-waypoint
  --shared-backend backend={backend};\
  path={path}
  @@ -111,7 +111,7 @@ impl StorageHelper {
  pub fn genesis(&self, genesis_path: &Path) -> Result<Transaction, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  genesis
  --shared-backend backend={backend};\
  path={path}
  @@ -129,7 +129,7 @@ impl StorageHelper {
  pub fn insert_waypoint(&self, validator_ns: &str, shared_ns: &str) -> Result<Waypoint, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  insert-waypoint
  --validator-backend backend={backend};\
  path={path};\
  @@ -155,7 +155,7 @@ impl StorageHelper {
  ) -> Result<Ed25519PublicKey, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  operator-key
  --validator-backend backend={backend};\
  path={path};\
  @@ -181,7 +181,7 @@ impl StorageHelper {
  ) -> Result<Ed25519PublicKey, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  owner-key
  --validator-backend backend={backend};\
  path={path};\
  @@ -208,7 +208,7 @@ impl StorageHelper {
  ) -> Result<libra_management::layout::Layout, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  set-layout
  --path {path}
  --shared-backend backend={backend};\
  @@ -233,7 +233,7 @@ impl StorageHelper {
  ) -> Result<String, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  set-operator
  --operator-name {operator_name}
  --validator-backend backend={backend};\
  @@ -265,7 +265,7 @@ impl StorageHelper {
  ) -> Result<Transaction, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  validator-config
  --owner-name {owner_name}
  --validator-address {validator_address}
  @@ -296,7 +296,7 @@ impl StorageHelper {
  pub fn verify(&self, namespace: &str) -> Result<String, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  verify
  --validator-backend backend={backend};\
  path={path};\
  @@ -314,7 +314,7 @@ impl StorageHelper {
  pub fn verify_genesis(&self, namespace: &str, genesis_path: &Path) -> Result<String, Error> {
  let args = format!(
  "
  - management
  + libra-genesis-tool
  verify
  --validator-backend backend={backend};\
  path={path};\
  