Merge pull request #5335 from zhouyuan/radosgw_admin_secret_key_alias

radosgw-admin: Create --secret-key alias for --secret

Reviewed-by: Yehuda Sadeh <yehuda@redhat.com>

diff --cc src/rgw/rgw_admin.cc
Simple merge

diff --cc src/test/cli/radosgw-admin/help.t
Simple merge