Because passing an InputStream to KXML does not close the
stream after the file has been parsed, the files are staying
locked on windows until the gc and finalizers are run.
This change preload the XML files and close their stream,
and then pass the content in a stream to the parser.
(cherry picked from commit c48b0b940d632b9862ff6aa32665e37fe9e50845)
Change-Id: I1b225454c166026c1aab6290c55ac8279e8862d5
135b5ba524