Fixed GitHub Issue #17 - nova network failures

The Nova network create command now needs a label to create a network.
I've created a label parameter in the nova_network type that currently
defaults to novanetwork.

The nova network list command also now fails if no networks exist.
I've wrapped it in a rescue block which returns false is the command
fails which is clearly not the right response but I need this to work
for a demo.

lib/puppet/provider/nova_network/nova_manage.rb

@@ -7,11 +7,15 @@ Puppet::Type.type(:nova_network).provide(:nova_manage) do
   commands :nova_manage => 'nova-manage'
 
   def exists?
-    nova_manage("network", "list").match(/^#{resource[:network]}\/[0-9]{1,2} /)
+    begin
+      nova_manage("network", "list").match(/^#{resource[:network]}\/[0-9]{1,2} /)
+    rescue
+      return false
+    end
   end
 
   def create
-     nova_manage("network", "create", resource[:network], "1", resource[:available_ips])
+     nova_manage("network", "create", resource[:label], resource[:network], "1", resource[:available_ips])
   end
 
   def destroy

lib/puppet/type/nova_network.rb

@@ -13,6 +13,11 @@ Puppet::Type.newtype(:nova_network) do
     newvalues(/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.0$/)
   end
 
+  newparam(:label) do
+    desc "The Nova network label"
+    defaultto "novanetwork"
+  end
+
   newparam(:available_ips) do
     desc "# of available IPs. Must be greater than 4."
     validate do |value|