Bug#847173: passwd: "usermod -l" don't change "suguid" and "subgid"

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Subject: passwd: "usermod -l" don't change "suguid" and "subgid"
Package: passwd
Version: 1:4.2-3.1ubuntu5
Command

usermod old_login --login new_login

does not change old_login
in files "/etc/suguid" and "/etc/subgid".