[default] /etc/default/sensu changes should notify service restarts
Merge pull request #209 from portertech/default

/etc/default/sensu changes should notify service restarts
Fix yum 3.0.0 issues

Yum 3.0.0 introduced gpgchecking=1 by default.  Since the sensu packages are unsigned, this did not work.
Merge pull request #214 from rtewalt/yum_300_fix

Fix yum 3.0.0 issues