Document requirement for 'insecure-registries'
Document requirement for 'insecure-registries'

Signed-off-by: Dan Mick <b07550071eaa6a9296289c43bbd6c90559196431@redhat.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/nfs,rook/nfs,rook/nfs,rook/rook