testbed-idp requires to be run from a JDK?

[Rod Widdowson]

> > Maybe this should just be a JIRA case?
> 
> Please.

IDP-468.

I noted in the case that I am unconvinced that we need to "die in a ditch"
for this.  After all jsp is not our default behaviour and anyone who really
needs jsp is probably wise enough to install a JDK.

R