workflow-xslt: Allow internal XML to be dumped before XSLT is parsed

This makes it easier to debug failing XSLT templates, as workflow-xslt won't
always give good enough error messages when parsing XSLT files.  By dumping the
internal XML file before starting the XSLT processing, that XML can be used
directly with xsltproc for more deeper going XSLT debugging.

Signed-off-by: David Sommerseth <davids@redhat.com>
Merge "workflow-xslt: Allow internal XML to be dumped before XSLT is parsed" into develop