utils: remove needless mutex

Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
entire: renaming, node -> process, machine

Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
inspector: renaming, node -> process

Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>