Add etcd part of config support, add noColor/json support (#8439)

- Add color/json mode support for get/help commands
- Support ENV help for all sub-systems
- Add support for etcd as part of config

cmd/crypto/vault_test.go

@@ -25,7 +25,7 @@ var verifyVaultConfigTests = []struct {
 }{
 	{
 		ShouldFail: false, // 0
-		Config:     VaultConfig{},
+		Config:     emptyVaultConfig,
 	},
 	{
 		ShouldFail: true,