Patch practical usability issues with Society (#4651)

* Add `max_members` to `found`, add society genesis for Substrate node

* Update test

* Use `Option<bool>` rather than `Option<()>`

* Update from feedback

substrate/bin/node/testing/src/genesis.rs

@@ -20,7 +20,7 @@ use crate::keyring::*;
 use sp_keyring::{Ed25519Keyring, Sr25519Keyring};
 use node_runtime::{
 	GenesisConfig, BalancesConfig, SessionConfig, StakingConfig, SystemConfig,
-	GrandpaConfig, IndicesConfig, ContractsConfig, WASM_BINARY,
+	GrandpaConfig, IndicesConfig, ContractsConfig, SocietyConfig, WASM_BINARY,
 };
 use node_runtime::constants::currency::*;
 use sp_core::ChangesTrieConfiguration;
@@ -96,5 +96,10 @@ pub fn config(support_changes_trie: bool, code: Option<&[u8]>) -> GenesisConfig
 		pallet_membership_Instance1: Some(Default::default()),
 		pallet_sudo: Some(Default::default()),
 		pallet_treasury: Some(Default::default()),
+		pallet_society: Some(SocietyConfig {
+			members: vec![alice(), bob()],
+			pot: 0,
+			max_members: 999,
+		}),
 	}
 }