Check and report on errors from pushy()'d commands
Check and report on errors from pushy()'d commands

Signed-off-by: Dan Mick <b07550071eaa6a9296289c43bbd6c90559196431@inktank.com>

ktdreyer/ceph-deploy,SUSE/ceph-deploy-to-be-deleted,Vicente-Cheng/ceph-deploy,SUSE/ceph-deploy,imzhulei/ceph-deploy,imzhulei/ceph-deploy,jumpstarter-io/ceph-deploy,branto1/ceph-deploy,ddiss/ceph-deploy,isyippee/ceph-deploy,SUSE/ceph-deploy-to-be-deleted,codenrhoden/ceph-deploy,codenrhoden/ceph-deploy,trhoden/ceph-deploy,trhoden/ceph-deploy,osynge/ceph-deploy,jumpstarter-io/ceph-deploy,zhouyuan/ceph-deploy,alfredodeza/ceph-deploy,ktdreyer/ceph-deploy,ghxandsky/ceph-deploy,SUSE/ceph-deploy,rtulke/ceph-deploy,alfredodeza/ceph-deploy,zhouyuan/ceph-deploy,isyippee/ceph-deploy,Vicente-Cheng/ceph-deploy,rtulke/ceph-deploy,shenhequnying/ceph-deploy,ddiss/ceph-deploy,osynge/ceph-deploy,branto1/ceph-deploy,ceph/ceph-deploy,ceph/ceph-deploy,ghxandsky/ceph-deploy,shenhequnying/ceph-deploy