osd: data loss: low space handling
osd: data loss: low space handling

Automated test cases for feature #4197

Signed-off-by: David Zafman <326b7ae36af5adcb9ee37c37a979aea1bc3fff0c@inktank.com>
Reported-by: Sam Just <8c40222f34b9721b5d5709d4ed45337913ea1c3e@inktank.com>

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