Use refactored process-embeded-wadl code for api-ref page

The xslt that pulls wadl content into a DocBook document
failed to pull in template parameters. This code had
already been completely refactored for the webhelp and
pdf pipelines. The api-ref pipeline now uses this same
(much cleaner) refactored code.

Change-Id: Ie5b064fe5ed361313571fd1487917eb269bcf600
Closes-Bug: #1327403
Merge "Use refactored process-embeded-wadl code for api-ref page"