Fix generation of ha localized guide

The generatedocbook tool only works on XML files.
For the high-availability guide, we first need to generate the XML file
and then integrate translations - and take care that the build job not
regenerates the XML file.

Change-Id: Iab7a72d2819b4fc5d0bac53b8a9ccba2ba9ef0ef
Merge "Fix generation of ha localized guide"