Delete starting empty line

When header is empty it shouldn't add an starting empty
new line
Fix Rex::MIME::Message specs
Add some randomized variables to JSP Payloads

Because the JASPER engine with Tomcat has been found
complaining about the out variable.
Add module for ZDI-14-372
Fix clean up
Just randomize
touch up lib/rex/mime/message.rb
touch up visual_mining_netcharts_upload
Land #4139, Visual Mining NetCharts

landed after some touch up