syslog: Refactor to expose logfile names
syslog: Refactor to expose logfile names

Signed-off-by: Zack Cerza <d7cdf09fc0f0426e98c9978ee42da5d61fa54986@redhat.com>

michaelsevilla/teuthology,dreamhost/teuthology,caibo2014/teuthology,robbat2/teuthology,ivotron/teuthology,caibo2014/teuthology,dmick/teuthology,ktdreyer/teuthology,dmick/teuthology,ceph/teuthology,ceph/teuthology,dmick/teuthology,SUSE/teuthology,robbat2/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,SUSE/teuthology,dreamhost/teuthology,ivotron/teuthology,SUSE/teuthology