Changes

Releasing using OpenJDK (latest) instead of 8uX.
The infra structure used to publish releases (EF Jenkins) from time to 
time changes its set of supported JDK. This includes removal of some 
platforms, like Open JDK 8. So there is an ongoing need to update the 
Jenkinsfile, which is a burden without actual benefit.
Instead of this ongoing changes, we will use the latest Open JDK release 
always, which is done by using the "latest" label of the JDK 
declaration.

Jenkinsfile explicitly refers to external config files
The EF's new Jenkins infrastructure needs a change in the Jenkinsfiles: 
The external Maven configuration files have to be explicitly declared 
now.

Fix for [MJAVADOC-575]

Clarify that ParamConverters must be preferred and work with all types