call ceph-disk zap instead of re-implementing it

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge pull request #218 from alfredodeza/8793

call ceph-disk zap instead of re-implementing it
SUSE uses zypper and not yum

this code removes errors when setting the repo on the command line add a zypper
template

Signed-off-by:  Owen Synge <osynge@suse.com>

Closes #213