Remove static password

Remove static password into file passwords.yml

Change-Id: I68d766b9d9b4a7055629473de9bb9d6ab59d8503
Closes-Bug: #1559266

etc/kolla/passwords.yml

@@ -58,12 +58,12 @@ magnum_keystone_password:
 mistral_database_password:
 mistral_keystone_password:
 
-horizon_secret_key: "password"
+horizon_secret_key:
 
-manila_database_password: "password"
-manila_keystone_password: "password"
+manila_database_password:
+manila_keystone_password:
 
-memcache_secret_key: "password"
+memcache_secret_key:
 
 ####################
 # RabbitMQ options