DaemonState: add wait()
DaemonState: add wait()

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@redhat.com>

dreamhost/teuthology,tchaikov/teuthology,robbat2/teuthology,dmick/teuthology,tchaikov/teuthology,t-miyamae/teuthology,michaelsevilla/teuthology,SUSE/teuthology,ceph/teuthology,ivotron/teuthology,yghannam/teuthology,zhouyuan/teuthology,ceph/teuthology,dreamhost/teuthology,t-miyamae/teuthology,SUSE/teuthology,michaelsevilla/teuthology,robbat2/teuthology,ivotron/teuthology,dmick/teuthology,caibo2014/teuthology,caibo2014/teuthology,ktdreyer/teuthology,ktdreyer/teuthology,yghannam/teuthology,dmick/teuthology,SUSE/teuthology,zhouyuan/teuthology