It looks like this has been the case for a while. I can see the same warning on unique_identifier devel jobs for all ROS distros (e.g. [indigo on trusty](
http://build.ros.org/job/Idev__unique_identifier__ubuntu_trusty_amd64/3/consoleFull#console-section-11)).
It looks like distutils [never supported the option (?)](
http://stackoverflow.com/questions/8295644/pypi-userwarning-unknown-distribution-option-install-requires)
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