NIFI-7602 added verify phase so contrib-check can actually execute
NIFI-7602 added verify phase so contrib-check can actually execute

This closes #4388

Signed-off-by: Mike Thomsen <1dcb36bd86ade8539a44c55175d0c9f9c11f21a5@apache.org>

MikeThomsen/nifi,pvillard31/nifi,mattyb149/nifi,jfrazee/nifi,mattyb149/nifi,pvillard31/nifi,pvillard31/nifi,mattyb149/nifi,MikeThomsen/nifi,jfrazee/nifi,pvillard31/nifi,MikeThomsen/nifi,jfrazee/nifi,jfrazee/nifi,pvillard31/nifi,mattyb149/nifi,mattyb149/nifi,jfrazee/nifi,MikeThomsen/nifi,mattyb149/nifi,jfrazee/nifi,mattyb149/nifi,MikeThomsen/nifi,pvillard31/nifi,MikeThomsen/nifi,pvillard31/nifi,jfrazee/nifi,MikeThomsen/nifi,pvillard31/nifi,jfrazee/nifi