PDI-9555 - Webservice via /kettle/executeTrans - Pass output to servlet
option: getServletPrintWriter does not respect UTF-8 encoding

What was done:
1) added new variable KETTLE_DEFAULT_SERVLET_ENCODING
2) changed the way PrintWriter for servlet output is instantionated.
3) changed the way Trans creates servletPrintWriter
Merge pull request #316 from kolinus/PDI-9555

PDI-9555 - Webservice via /kettle/executeTrans - Pass output to servlet option: getServletPrintWriter does not respect UTF-8 encoding