stringify prefix networks and not its subnets

Author: fmoehler

src/bosh-director/lib/bosh/director/deployment_plan/dynamic_network.rb

@@ -86,7 +86,7 @@ def self.check_validity_of_availability_zone(availability_zone, availability_zon
       def initialize(name, subnets, prefix, logger)
         super(name, logger)
         @subnets = subnets
-        @prefix = prefix
+        @prefix = prefix.to_s
       end
 
       attr_reader :subnets

src/bosh-director/lib/bosh/director/deployment_plan/manual_network.rb

@@ -38,7 +38,7 @@ def managed?
       def initialize(name, subnets, prefix, logger, managed = false)
         super(name, TaggedLogger.new(logger, 'network-configuration'))
         @subnets = subnets
-        @prefix = prefix
+        @prefix = prefix.to_s
         @managed = managed
       end
 

src/bosh-director/lib/bosh/director/deployment_plan/vip_network.rb

@@ -35,7 +35,7 @@ def initialize(name, cloud_properties, subnets, prefix, logger)
         super(name, logger)
         @cloud_properties = cloud_properties
         @subnets = subnets
-        @prefix = prefix
+        @prefix = prefix.to_s
         @logger = TaggedLogger.new(logger, 'network-configuration')
       end