Manila: Hide password strings

This change ensures that parameters to define password strings are
properly hidden, because the credentials should be secret.

Change-Id: Ib07b204050a4a15266b7652ae5f284c56ecdad17
(cherry picked from commit 012121109e)

deployment/manila/manila-backend-isilon.yaml

@@ -16,6 +16,7 @@ parameters:
   ManilaIsilonNasPassword:
     type: string
     default: ''
+    hidden: true
   ManilaIsilonNasServer:
     type: string
     default: ''

deployment/manila/manila-backend-netapp.yaml

@@ -16,6 +16,7 @@ parameters:
   ManilaNetappPassword:
     type: string
     default: ''
+    hidden: true
   ManilaNetappServerHostname:
     type: string
     default: ''

deployment/manila/manila-backend-unity.yaml

@@ -16,6 +16,7 @@ parameters:
   ManilaUnityNasPassword:
     type: string
     default: ''
+    hidden: true
   ManilaUnityNasServer:
     type: string
     default: ''

deployment/manila/manila-backend-vmax.yaml

@@ -16,6 +16,7 @@ parameters:
   ManilaVMAXNasPassword:
     type: string
     default: ''
+    hidden: true
   ManilaVMAXNasServer:
     type: string
     default: ''

deployment/manila/manila-backend-vnx.yaml

@@ -16,6 +16,7 @@ parameters:
   ManilaVNXNasPassword:
     type: string
     default: ''
+    hidden: true
   ManilaVNXNasServer:
     type: string
     default: ''