contrib/spleen: update to Spleen 2.0.0

Merge commit '533de2d7a9875ff652be477a3f6c817d66a3d3d9'

Submitted by: Frederic Cambus
Differential Revision: https://reviews.freebsd.org/D40378

Add 'contrib/spleen/' from commit '5eab6333fa27e2b6954c6927859d462a004e57bb'

git-subtree-dir: contrib/spleen
git-subtree-mainline: 3582acbad303bb69895457a8a7dae0f485efe8ea
git-subtree-split: 5eab633

Add 'contrib/spleen/' from commit '5eab6333fa27e2b6954c6927859d462a004e57bb'

git-subtree-dir: contrib/spleen
git-subtree-mainline: 3582acbad303bb69895457a8a7dae0f485efe8ea
git-subtree-split: 5eab6333fa27e2b6954c6927859d462a004e57bb

Reviewed by: imp [earlier]
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20653

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