LPS-31525

> If we have to worry about the context being empty in redeployTomcat, I think we should have a similar check in redeployJetty, right?

Added the same thing for Jetty.

> Also, are you sure we even need to worry about context being empty?

Yes - servlet spec says that root context is empty string. However, root context returned from i.e. RenderRequest is equal to slash. Therefore we detect both situation. 

> If context is empty, you make context = "/ROOT", which results in fileName = "//ROOT/WEB-INF/web.xml", looks like we have a slash too many now.

Sure :)