Turn off doclint on java 8.
Turn off doclint on java 8.

For now turn off doclint if running on java 8. There is a
separate ticket (https://github.com/Netflix/spectator/issues/27)
to track fixing the warnings if it is deemed to be worthwhile.

cfieber/spectator,Netflix/spectator,pstout/spectator,pstout/spectator,cfieber/spectator,dmuino/spectator,rspieldenner/spectator,brharrington/spectator,dmuino/spectator,rspieldenner/spectator