Create example application for remote ejb calls

[SvenBunge]

create an example application for remote ejb calls.

Test if the tracee context is propagated correctly for all standard application server:

• JBoss AS
• Apache TomEE
• Glassfish
• ...

The example application should be embedded into the servlet example webapp (configurable on /off)

[SvenBunge]

Moved comment of @tobiasgindler :

Added small local remote ejb example application and integrated it into the example webapp.

I have tested the functionality with an Apache TomEE.
Local Remote EJB calls are handled in the same Thread, so the tracee context was available to the EJB and everything as expected. But we still must check the other application servers.