Issue #1184: Changes for Abiquo. @Named annotations in all async api methods

Once all apis have been annotated, we could consider refactoring a bit and adding [this test](https://github.com/nacx/jclouds/blob/94c5902cc37dbe47e44049e83aa46c1c4ad228f5/labs/abiquo/src/test/java/org/jclouds/abiquo/features/MissingNamedMethodsTest.java) to the expect and async api test base classes, to make sure all apis will always be properly annotated.