ceph_manager: mark in a bit more often than out
ceph_manager: mark in a bit more often than out

Otherwise we can get into cases where many/most nodes are out, and things
don't work as well.  e.g., crush may start to fail.

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