tmpnet: Break config.go up into coherent parts

- Move NetworkConfig functionality to Network
- Move NodeConfig functionality to Node
- Move FlagsMap to flags.go
- Move genesis helpers to genesis.go
- Move NodeURI and key generation to utils.go
- Remove redundant node_test.go

tests/fixture/e2e/env.go

@@ -69,7 +69,7 @@ func NewTestEnvironment(flagVars *FlagVars) *TestEnvironment {
 		network = StartNetwork(flagVars.AvalancheGoExecPath(), DefaultNetworkDir)
 	}
 
-	uris := network.GetURIs()
+	uris := tmpnet.GetNodeURIs(network.Nodes)
 	require.NotEmpty(uris, "network contains no nodes")
 	tests.Outf("{{green}}network URIs: {{/}} %+v\n", uris)
 

tests/fixture/tmpnet/README.md

@@ -24,12 +24,14 @@ repositories.
 The functionality in this package is grouped by logical purpose into
 the following non-test files:
 
-| Filename    | Types   | Purpose                                       |
-|:------------|:--------|:----------------------------------------------|
-| defaults.go | <none>  | Default configuration                         |
-| network.go  | Network | Network-level orchestration and configuration |
-| node.go     | Node    | Node-level orchestration and configuration    |
-| util.go     | <none>  | Shared utility functions                      |
+| Filename          | Types       | Purpose                                        |
+|:------------------|:------------|:-----------------------------------------------|
+| defaults.go       |             | Defines common default configuration           |
+| flags.go          | FlagsMap    | Simplifies configuration of avalanchego flags  |
+| genesis.go        |             | Creates test genesis                           |
+| network.go        | Network     | Orchestrates and configures temporary networks |
+| node.go           | Node        | Orchestrates and configures nodes              |
+| utils.go          |             | Defines shared utility functions               |
 
 ## Usage