cmdparse.cc: catch exception by reference

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
rgw/rgw_rados.cc: use empty() instead of checking for size() > 0

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
rgw/rgw_rest_opstate.cc: prefer prefix ++operator for non-trivial iterator

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
test_rgw_admin_meta.cc: prefer prefix ++operator for non-trivial iterator

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
test_rgw_admin_opstate.cc: prefer prefix ++operator for non-trivial iterator

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
test_rgw_admin_log.cc: prefer prefix ++operator for non-trivial iterator

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
cls/rgw/cls_rgw.cc: use empty() instead of checking for size() == 0

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
test_rgw_admin_meta.cc: prefer prefix ++operator for non-trivial iterator

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
Merge pull request #426 from dalgaaf/wip-da-SCA-cppcheck-5

Fix some typical SCA issues from cppcheck

Reviewed-by: Sage Weil <sage@inktank.com>