Refactored method invocation
Create the entries of Translation and TranslationStaticAddress
Added a fabrication for public2gw
Fixed the fabrication for simulated interface
Added functions to search/create simulated interfaces and route/route_link.
Added some fabrications.
Created the db entries for global ip translation.
Fixed the db entries for static address translation.
Merge branch 'master' into feature-vdc-vnet-global-nat
Added error messages.
Added a function to create datapath_network automatically.
Fixed network lookup and host interface lookup for datapath_network.
Fixed the parameters for ip_lease.
Merge branch 'master' into feature-vdc-vnet-global-nat

Conflicts:
	vnet/lib/vnet/plugins/vdc_vnet_plugin.rb
Fixed a mistake in hash
Added missing configuration for vna.conf
Added default route
Merge branch 'master' into feature-vdc-vnet-global-nat
Fixed delete_entry.
Refactored network and security_group creation.