multibag support on riak-cs-debug.
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Translate diff in #943
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Merge pull request #941 from basho/hotfix/release-notes-ja-1.5

Some updates after last translation

Reviewed-by: shino,kuenishi
Merge pull request #930 from basho/feature/multibag-support-on-riak-cs-debug

Multibag support on riak-cs-debug.

Reviewed-by: kuenishi
Cut out user related codes to riak_cs_user from riak_cs_utils
Move riak_cs_mp_utils:user_rec_to_3tuple/1 to riak_cs_user:to_3tuple/1