Bug 553769: [Doclet] add support for Java9 Doclet API

  added support to call the doclet from java9.
  However links are currently only generated correctly JavaDoc files
  created with Java9 or older. Afterwards the format of the HTML files
  changes, resulting in invalid links to documents.

Change-Id: Iaedb5eded7b332965d9d9520a59d4b409f3f0d5c
32 files changed