Add get_default_gateways() parser function

for getting list of default gateways. This list ordered by
gateway_metric.

Change-Id: I36e6c63293992331df6e3f07c6738ceaa2cb4dd7
related-blueprint: templates-for-networking

deployment/puppet/l23network/spec/functions/get_default_gateways__spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+require 'yaml'
+require 'puppetx/l23_hash_tools'
+
+describe Puppet::Parser::Functions.function(:get_default_gateways) do
+let(:network_scheme) do
+<<eof
+---
+  version: 1.1
+  provider: lnx
+  interfaces:
+    eth0:
+      mtu: 2048
+    eth1:
+      mtu: 999
+    eth2: {}
+    eth3: {}
+    eth4: {}
+    eth5: {}
+    eth44: {}
+  endpoints:
+    eth0:
+      IP: 'none'
+    eth4:
+      IP: 'none'
+    br-ex:
+      gateway: 10.1.3.1
+      IP:
+        - '10.1.3.11/24'
+    br-mgmt:
+      gateway: 10.1.1.1
+      gateway_metric: 20
+      IP:
+        - '10.1.1.11/24'
+    br-storage:
+      gateway: 10.1.2.1
+      gateway_metric: 10
+      IP:
+        - '10.1.2.11/24'
+    br-floating:
+      IP: none
+eof
+end
+
+
+
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  subject do
+    function_name = Puppet::Parser::Functions.function(:get_default_gateways)
+    scope.method(function_name)
+  end
+
+  context ":get_default_gateways() usage" do
+    before(:each) do
+      scope.stubs(:lookupvar).with('l3_fqdn_hostname').returns('node1.tld')
+      L23network::Scheme.set_config(
+        scope.lookupvar('l3_fqdn_hostname'),
+        L23network.sanitize_keys_in_hash(YAML.load(network_scheme))
+      )
+    end
+
+    it 'should exist' do
+      subject == Puppet::Parser::Functions.function(:get_default_gateways)
+    end
+
+    it do
+      should run.with_params().and_return(['10.1.3.1', '10.1.2.1', '10.1.1.1'])
+    end
+
+  end
+
+end