Add default_for_az attribute to subnet

* Add new attribute `default_for_az` to `Subnet` model;
* Update parsers to take into account new attribute;
* Fix comments and tests for `map_public_ip_on_launch` attribute.

lib/fog/aws/models/compute/subnet.rb

@@ -10,6 +10,7 @@ module Fog
         attribute :availability_zone,           :aliases => 'availabilityZone'
         attribute :tag_set,                     :aliases => 'tagSet'
         attribute :map_public_ip_on_launch,     :aliases => 'mapPublicIpOnLaunch'
+        attribute :default_for_az,              :aliases => 'defaultForAz'
 
         def ready?
           requires :state

lib/fog/aws/parsers/compute/create_subnet.rb

@@ -32,6 +32,8 @@ module Fog
               case name
               when 'subnetId', 'state', 'vpcId', 'cidrBlock', 'availableIpAddressCount', 'availabilityZone'
                 @subnet[name] = value
+              when 'mapPublicIpOnLaunch', 'defaultForAz'
+                @subnet[name] = value == 'true' ? true : false
               when 'subnet'
                 @response['subnet'] = @subnet
               when 'requestId'

lib/fog/aws/parsers/compute/describe_subnets.rb

@@ -32,7 +32,7 @@ module Fog
               case name
               when 'subnetId', 'state', 'vpcId', 'cidrBlock', 'availableIpAddressCount', 'availabilityZone'
                 @subnet[name] = value
-              when 'mapPublicIpOnLaunch'
+              when 'mapPublicIpOnLaunch', 'defaultForAz'
                 @subnet[name] = value == 'true' ? true : false
               when 'item'
                 @response['subnetSet'] << @subnet

lib/fog/aws/requests/compute/create_subnet.rb

@@ -21,12 +21,14 @@ module Fog
         #   * 'subnetId'<~String> - The Subnet's ID
         #   * 'state'<~String> - The current state of the Subnet. ['pending', 'available']
         #   * 'cidrBlock'<~String> - The CIDR block the Subnet covers.
-        # * 'AvailableIpAddressCount'<~Integer> - The number of unused IP addresses in the subnet (the IP addresses for any stopped
+        #   * 'availableIpAddressCount'<~Integer> - The number of unused IP addresses in the subnet (the IP addresses for any stopped
         #     instances are considered unavailable)
-        # * 'AvailabilityZone'<~String> - The Availability Zone the subnet is in
+        #   * 'availabilityZone'<~String> - The Availability Zone the subnet is in
         #   * 'tagSet'<~Array>: Tags assigned to the resource.
         #     * 'key'<~String> - Tag's key
         #     * 'value'<~String> - Tag's value
+        #   * 'mapPublicIpOnLaunch'<~Boolean> - Indicates whether instances launched in this subnet receive a public IPv4 address.
+        #   * 'defaultForAz'<~Boolean> - Indicates whether this is the default subnet for the Availability Zone.
         #
         # {Amazon API Reference}[http://docs.amazonwebservices.com/AWSEC2/2011-07-15/APIReference/ApiReference-query-CreateSubnet.html]
         def create_subnet(vpcId, cidrBlock, options = {})
@@ -65,7 +67,9 @@ module Fog
                 'cidrBlock'                => cidrBlock,
                 'availableIpAddressCount'  => "255",
                 'availabilityZone'         => av_zone,
-                'tagSet'                   => {}
+                'tagSet'                   => {},
+                'mapPublicIpOnLaunch'      => true,
+                'defaultForAz'             => true
               }
 
               # Add this subnet to the default network ACL

lib/fog/aws/requests/compute/describe_subnets.rb

@@ -24,7 +24,8 @@ module Fog
         #   * 'tagSet'<~Array>: Tags assigned to the resource.
         #     * 'key'<~String> - Tag's key
         #     * 'value'<~String> - Tag's value
-        # * 'instanceTenancy'<~String> - The allowed tenancy of instances launched into the Subnet.
+        #   * 'mapPublicIpOnLaunch'<~Boolean> - Indicates whether instances launched in this subnet receive a public IPv4 address.
+        #   * 'defaultForAz'<~Boolean> - Indicates whether this is the default subnet for the Availability Zone.
         #
         # {Amazon API Reference}[http://docs.amazonwebservices.com/AWSEC2/2011-07-15/APIReference/index.html?ApiReference-query-DescribeSubnets.html]
         def describe_subnets(filters = {})

tests/requests/compute/subnet_tests.rb

@@ -8,6 +8,8 @@ Shindo.tests('Fog::Compute[:aws] | subnet requests', ['aws']) do
     'availableIpAddressCount'  => String,
     'availabilityZone'         => String,
     'tagSet'                   => Hash,
+    'mapPublicIpOnLaunch'      => Fog::Boolean,
+    'defaultForAz'             => Fog::Boolean,
   }
 
   @single_subnet_format = {