Remove default for the RabbitMQ password

Since the password is now autogenerated from the tripleoclient,
there is no need to keep the default value here.

Change-Id: If41cb56134966456f8590da04f392faffe5c62a1
Closes-Bug: #1557688

overcloud.yaml

@@ -278,13 +278,11 @@ parameters:
     type: string
     default: unset
     description: Salt for the rabbit cookie, change this to force the randomly generated rabbit cookie to change.
-  # FIXME: 'guest' is provisioned in RabbitMQ by default, we should create a user if these are changed
   RabbitUserName:
     default: guest
     description: The username for RabbitMQ
     type: string
   RabbitPassword:
-    default: guest
     description: The password for RabbitMQ
     type: string
     hidden: true

puppet/cinder-storage.yaml

@@ -51,7 +51,6 @@ parameters:
     description: Name of an existing Nova key pair to enable SSH access to the instances
     type: string
   RabbitPassword:
-    default: 'guest'
     type: string
     hidden: true
   RabbitUserName:

puppet/compute.yaml

@@ -251,7 +251,6 @@ parameters:
     type: string
     default: ''  # Has to be here because of the ignored empty value bug
   RabbitPassword:
-    default: guest
     description: The password for RabbitMQ
     type: string
     hidden: true

puppet/controller.yaml

@@ -595,7 +595,6 @@ parameters:
     default: ''  # Has to be here because of the ignored empty value bug
     hidden: true
   RabbitPassword:
-    default: guest
     description: The password for RabbitMQ
     type: string
     hidden: true