NIFI-6187 - Added checkbox task for building on JDK 8 and JDK 11.
NIFI-6187 - Added checkbox task for building on JDK 8 and JDK 11.

Signed-off-by: Pierre Villard <pierre.villard.fr@gmail.com>

This closes #3680.

pvillard31/nifi,ijokarumawak/nifi,mattyb149/nifi,bbende/nifi,YolandaMDavis/nifi,mcgilman/nifi,YolandaMDavis/nifi,mattyb149/nifi,alopresto/nifi,jfrazee/nifi,jfrazee/nifi,alopresto/nifi,aperepel/nifi,trixpan/nifi,pvillard31/nifi,jskora/nifi,mattyb149/nifi,trixpan/nifi,mans2singh/nifi,patricker/nifi,jskora/nifi,patricker/nifi,mcgilman/nifi,bbende/nifi,patricker/nifi,trixpan/nifi,mcgilman/nifi,MikeThomsen/nifi,YolandaMDavis/nifi,MikeThomsen/nifi,alopresto/nifi,patricker/nifi,aperepel/nifi,MikeThomsen/nifi,mcgilman/nifi,m-hogue/nifi,aperepel/nifi,pvillard31/nifi,alopresto/nifi,mans2singh/nifi,alopresto/nifi,m-hogue/nifi,pvillard31/nifi,YolandaMDavis/nifi,mattyb149/nifi,jskora/nifi,jfrazee/nifi,pvillard31/nifi,aperepel/nifi,m-hogue/nifi,jfrazee/nifi,m-hogue/nifi,aperepel/nifi,alopresto/nifi,mcgilman/nifi,m-hogue/nifi,m-hogue/nifi,jtstorck/nifi,MikeThomsen/nifi,patricker/nifi,mcgilman/nifi,mattyb149/nifi,alopresto/nifi,ijokarumawak/nifi,mattyb149/nifi,ijokarumawak/nifi,jtstorck/nifi,pvillard31/nifi,jtstorck/nifi,pvillard31/nifi,MikeThomsen/nifi,mans2singh/nifi,ijokarumawak/nifi,jtstorck/nifi,jtstorck/nifi,MikeThomsen/nifi,patricker/nifi,jfrazee/nifi,mattyb149/nifi,jtstorck/nifi,mcgilman/nifi,ijokarumawak/nifi,bbende/nifi,jfrazee/nifi,jtstorck/nifi,jfrazee/nifi,YolandaMDavis/nifi,bbende/nifi,ijokarumawak/nifi,pvillard31/nifi,jskora/nifi,YolandaMDavis/nifi,jskora/nifi,bbende/nifi,mans2singh/nifi,bbende/nifi,m-hogue/nifi,trixpan/nifi,trixpan/nifi,trixpan/nifi,YolandaMDavis/nifi,MikeThomsen/nifi,jskora/nifi,mans2singh/nifi,aperepel/nifi,patricker/nifi,mans2singh/nifi,jfrazee/nifi