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/legacy.go

@@ -122,7 +122,10 @@ func lookupConfigLegacy(kvs config.KVS) (KMSConfig, error) {
 	cfg := KMSConfig{
 		AutoEncryption: autoBool,
 	}
-	stateBool, err := config.ParseBool(kvs.Get(config.State))
+	// Assume default as "on" for legacy config since we didn't have a _STATE
+	// flag to turn it off, but we should honor it nonetheless to turn it off
+	// if the vault endpoint is down and there is no way to start the server.
+	stateBool, err := config.ParseBool(env.Get(EnvKMSVaultState, config.StateOn))
 	if err != nil {
 		return cfg, err
 	}

cmd/crypto/vault.go

@@ -69,7 +69,11 @@ type vaultService struct {
 var _ KMS = (*vaultService)(nil) // compiler check that *vaultService implements KMS
 
 // empty/default vault configuration used to check whether a particular is empty.
-var emptyVaultConfig = VaultConfig{}
+var emptyVaultConfig = VaultConfig{
+	Auth: VaultAuth{
+		Type: "approle",
+	},
+}
 
 // IsEmpty returns true if the vault config struct is an
 // empty configuration.

cmd/crypto/vault_test.go

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