Unify execution layer endpoints (#3214)

## Issue Addressed

Resolves #3069 

## Proposed Changes

Unify the `eth1-endpoints` and `execution-endpoints` flags in a backwards compatible way as described in https://github.com/sigp/lighthouse/issues/3069#issuecomment-1134219221

Users have 2 options:
1. Use multiple non auth execution endpoints for deposit processing pre-merge
2. Use a single jwt authenticated execution endpoint for both execution layer and deposit processing post merge

Related https://github.com/sigp/lighthouse/issues/3118

To enable jwt authenticated deposit processing, this PR removes the calls to `net_version` as the `net` namespace is not exposed in the auth server in execution clients. 
Moving away from using `networkId` is a good step in my opinion as it doesn't provide us with any added guarantees over `chainId`. See https://github.com/ethereum/consensus-specs/issues/2163 and https://github.com/sigp/lighthouse/issues/2115


Co-authored-by: Paul Hauner <paul@paulhauner.com>

testing/eth1_test_rig/src/ganache.rs

@@ -16,17 +16,11 @@ pub struct GanacheInstance {
     pub port: u16,
     child: Child,
     pub web3: Web3<Http>,
-    network_id: u64,
     chain_id: u64,
 }
 
 impl GanacheInstance {
-    fn new_from_child(
-        mut child: Child,
-        port: u16,
-        network_id: u64,
-        chain_id: u64,
-    ) -> Result<Self, String> {
+    fn new_from_child(mut child: Child, port: u16, chain_id: u64) -> Result<Self, String> {
         let stdout = child
             .stdout
             .ok_or("Unable to get stdout for ganache child process")?;
@@ -64,14 +58,13 @@ impl GanacheInstance {
             port,
             child,
             web3,
-            network_id,
             chain_id,
         })
     }
 
     /// Start a new `ganache` process, waiting until it indicates that it is ready to accept
     /// RPC connections.
-    pub fn new(network_id: u64, chain_id: u64) -> Result<Self, String> {
+    pub fn new(chain_id: u64) -> Result<Self, String> {
         let port = unused_tcp_port()?;
         let binary = match cfg!(windows) {
             true => "ganache.cmd",
@@ -89,8 +82,6 @@ impl GanacheInstance {
             .arg(format!("{}", port))
             .arg("--mnemonic")
             .arg("\"vast thought differ pull jewel broom cook wrist tribe word before omit\"")
-            .arg("--networkId")
-            .arg(format!("{}", network_id))
             .arg("--chain.chainId")
             .arg(format!("{}", chain_id))
             .spawn()
@@ -102,7 +93,7 @@ impl GanacheInstance {
                 )
             })?;
 
-        Self::new_from_child(child, port, network_id, chain_id)
+        Self::new_from_child(child, port, chain_id)
     }
 
     pub fn fork(&self) -> Result<Self, String> {
@@ -128,7 +119,7 @@ impl GanacheInstance {
                 )
             })?;
 
-        Self::new_from_child(child, port, self.network_id, self.chain_id)
+        Self::new_from_child(child, port, self.chain_id)
     }
 
     /// Returns the endpoint that this instance is listening on.
@@ -136,11 +127,6 @@ impl GanacheInstance {
         endpoint(self.port)
     }
 
-    /// Returns the network id of the ganache instance
-    pub fn network_id(&self) -> u64 {
-        self.network_id
-    }
-
     /// Returns the chain id of the ganache instance
     pub fn chain_id(&self) -> u64 {
         self.chain_id

testing/eth1_test_rig/src/lib.rs

@@ -30,8 +30,8 @@ pub struct GanacheEth1Instance {
 }
 
 impl GanacheEth1Instance {
-    pub async fn new(network_id: u64, chain_id: u64) -> Result<Self, String> {
-        let ganache = GanacheInstance::new(network_id, chain_id)?;
+    pub async fn new(chain_id: u64) -> Result<Self, String> {
+        let ganache = GanacheInstance::new(chain_id)?;
         DepositContract::deploy(ganache.web3.clone(), 0, None)
             .await
             .map(|deposit_contract| Self {