fix devel and doc reconfiguration if cache is behind #240
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The last nightly jobs (http://build.ros.org/job/Kdev_reconfigure-jobs/13/console#console-section-5 http://build.ros.org/job/Kdoc_reconfigure-jobs/11/console#console-section-5) failed because the rosdistro cache job for Kinetic was disabled and therefore the cache was out-of-date. While that should be uncommon the race condition still exists and is worked around by this patch.