[debian] Remove unused/redundant entries from debian/cubicweb-ctl.dirs * bash completion entry produces a lintian warning "package-installs-into-obsolete-dir etc/bash_completion.d/", and it does not install bash completion. * doc directory should be handled automatically.

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etc/init.d

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etc/cubicweb.d

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usr/bin

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var/log/cubicweb

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var/lib/cubicweb/backup

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var/lib/cubicweb/instances