test: rename salut/test/kclustering (to be like test/k-clustering)

salut/test/k-clustering/Makefile

salut/test/k-clustering/Makefile.dot

salut/test/k-clustering/Makefile.inc

salut/test/k-clustering/config.ml

salut/test/k-clustering/cost.lus

salut/test/k-clustering/dune

salut/test/k-clustering/dune-project

salut/test/k-clustering/dune-workspace

salut/test/k-clustering/kclustering_oracle.lus

salut/test/k-clustering/p.lus

salut/test/k-clustering/p.ml

salut/test/k-clustering/state.lus

salut/test/k-clustering/state.ml

salut/test/k-clustering/verify.lus