Fix package detection on centos in bootstrap
Fix package detection on centos in bootstrap

Signed-off-by: Josh Durgin <51652c783f70f5b272ebd02f1fd20d3af7a2449f@inktank.com>

Nexenta/s3-tests,timuralp/s3-tests,robbat2/s3-tests,ceph/s3-tests,SUSE/s3-tests,Nexenta/s3-tests,dreamhost/s3-tests,timuralp/s3-tests,andrewgaul/s3-tests,Intel-bigdata/s3-tests,piousbox/s3-tests,smithfarm/s3-tests,Intel-bigdata/s3-tests,Nexenta/s3-tests,Nexenta/s3-tests,SUSE/s3-tests,tobegit3hub/s3-tests,piousbox/s3-tests,robbat2/s3-tests,jmunhoz/s3-tests,tobegit3hub/s3-tests,ceph/s3-tests,andrewgaul/s3-tests,smithfarm/s3-tests,piousbox/s3-tests,jmunhoz/s3-tests,dreamhost/s3-tests