osd/device.pp: use osd_{mkfs/mount}*

Make use of the new options for mkfs and mount calls.

Set default for XFS mount options to rw,noatime,inode64 since the default
packages are 64bit. The XFS mkfs options stay at '-f', if you need other
options, specifiy them in ceph::conf.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>