Add option to configure max-peers

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

README.md

@@ -51,6 +51,7 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 | `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_max_peers` | ___unset___ | The maximum number of P2P connections you can establish |
 | `besu_network` | mainnet | The network that this node will join. Other values are 'ropsten', 'rinkeby', 'goerli', 'dev' and 'custom' |
 | `besu_genesis_path` | ___unset___ | The path to the genesis file, only valid when `besu_network` is `custom` |
 | `besu_sync_mode` | FAST | Specifies the synchronization mode. Other values are 'FULL' |

templates/config.toml.j2

@@ -60,6 +60,9 @@ graphql-http-cors-origins=[{{besu_graphql_http_cors_origins|map('to_json')|join(
 p2p-host="{{besu_host_ip}}"
 {% endif %}
 p2p-port={{besu_p2p_port}}
+{% if besu_max_peers is defined %}
+max_peers={{besu_max_peers}}
+{% endif %}
 
 # metrics
 metrics-enabled=true