set the tag version for remoto to 0.0.18

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
bump the ceph-deploy version to 1.5.8

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
update the changelog

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
1.5.8