Add identity configuration as per hyperledger/besu#150

Signed-off-by: Edward Evans <edward.evans@consensys.net>

README.md

@@ -44,6 +44,7 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 | `besu_launchd_dir` | /Library/LaunchAgents | The default launchd directory  |
 | `besu_systemd_dir` | /etc/systemd/system/ | The default systemd directory |
 | `besu_systemd_state` | restarted | The default option for the systemd service state |
+| `besu_identity` | ___unset___  | Configuration of Identity in the Client ID |
 | `besu_host_ip` | "" | The host IP that Besu uses for the P2P network. This specifies the host on which P2P listens |
 | `besu_default_ip` | "{{ default(ansible_host) \| default('127.0.0.1') }}" | The fallback default for `besu_host_ip` |
 | `besu_network` | mainnet | The network that this node will join. Other values are 'ropsten', 'rinkeby', 'goerli', 'dev' and 'custom' |

templates/config.toml.j2

@@ -15,6 +15,11 @@ genesis-file="{{ besu_genesis_path }}"
 sync-mode="{{besu_sync_mode}}"
 host-whitelist=[{{besu_host_whitelist|map('to_json')|join(',')}}]
 
+{% if besu_identity is defined %}
+# identity
+identity="{{ besu_identity }}"
+{% endif %}
+
 # rpc
 {% if besu_rpc_http_enabled|bool == True %}
 rpc-http-enabled={{besu_rpc_http_enabled}}