Swift: set default replicas to 3

Our existing default (replicas == 1) means that no data
(or copies) is being replicated in a multi-node Swift
environment. This seems like a bad production default
setting and could easily slip by if not set.

Setting it to 3 shouldn't hurt anything and seems to follow
suit with what several production installers (based around Puppet)
actually use. If using an installation with less than 3 swift
nodes I believe swift will do its best, and still work fine.

FWIW I noticed this when testing a multi-node Puppet swift
installation and was surprised when I didn't see any *data
files getting replicated across the storage cluster.

Change-Id: I44bdfff7aae6bdf845b79ca1f8f450c22113caed

controller-puppet.yaml

@@ -368,7 +368,7 @@ parameters:
     type: string
   SwiftReplicas:
     type: number
-    default: 1
+    default: 3
     description: How many replicas to use in the swift rings.
   VirtualIP:
     type: string

controller.yaml

@@ -368,7 +368,7 @@ parameters:
     type: string
   SwiftReplicas:
     type: number
-    default: 1
+    default: 3
     description: How many replicas to use in the swift rings.
   VirtualIP:
     type: string

overcloud-without-mergepy.yaml

@@ -388,7 +388,7 @@ parameters:
     type: number
   SwiftReplicas:
     type: number
-    default: 1
+    default: 3
     description: How many replicas to use in the swift rings.
 
 # Compute-specific params

swift-deploy.yaml

@@ -24,7 +24,7 @@ parameters:
     hidden: true
   SwiftReplicas:
     type: number
-    default: 1
+    default: 3
     description: How many replicas to use in the swift rings.
 resources:
   controller0Swift:

swift-storage-puppet.yaml

@@ -33,7 +33,7 @@ parameters:
     type: number
   Replicas:
     type: number
-    default: 1
+    default: 3
     description: How many replicas to use in the swift rings.
   SnmpdReadonlyUserName:
     default: ro_snmp_user

swift-storage.yaml

@@ -71,7 +71,7 @@ parameters:
     type: number
   Replicas:
     type: number
-    default: 1
+    default: 3
     description: How many replicas to use in the swift rings.
   SnmpdReadonlyUserName:
     default: ro_snmp_user