[travis] Remove jdk 11/15/16 (only use 8 as we transition over to actions)
[travis] Remove jdk 11/15/16 (only use 8 as we transition over to actions)

Waffle/waffle,dblock/waffle,hazendaz/waffle,Waffle/waffle,dblock/waffle,Waffle/waffle,dblock/waffle,dblock/waffle,hazendaz/waffle,hazendaz/waffle