Only generate MQTT credentials if command is compile or run.

Author: TheHackmeister

.gitignore

@@ -103,6 +103,6 @@ venv.bak/
 # mypy
 .mypy_cache/
 
-config/
+config
 tests/build/
 tests/.esphomeyaml/

esphomeyaml/yaml_util.py

@@ -280,7 +280,7 @@ def _gen_device_name(loader, node):
 
 def _gen_mqtt_username(loader, node):
     return _gen_device_name(loader, node)
-    
+
 def _gen_mqtt_password(loader, node):
     client = paho.mqtt.client.Client(client_id='esphomeyaml', clean_session=False)
     client.username_pw_set(os.environ['MQTT_USERNAME'],os.environ['MQTT_PASSWORD'] )
@@ -291,7 +291,7 @@ def _gen_mqtt_password(loader, node):
     client.connect(host='mqtt', port=8883)
 
     hal_mqtt_username = _gen_device_name(loader, node) 
-    if SafeLineLoader.command != "config":
+    if SafeLineLoader.command in ["compile", "run"]:
         vault_client = hvac.Client(url='https://vault:8200', token=os.environ['VAULT_TOKEN'], verify='ca')
         vault_client.token = os.environ['VAULT_TOKEN']
         hal_mqtt_password = vault_client.write("sys/tools/random/16")['data']['random_bytes']