ceph::osd::journal: basic support for non-xfs journal disks

Add mkfs and mount options to use other filesystems for the
journal disks as e.g. tmpfs. This should support now xfs and
tmpfs.

Feature: SMBCAP-3955

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph::conf: add "journal dio" parameter

Add support for setting "journal dio" to be able to deploy
the journal on tmpfs for testing.

Feature: SMBCAP-3955

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
Merge pull request #12 from TelekomCloud/feature/osd-journaldisks-tmpfs-support

ceph::osd::journal: basic support for non-xfs journal disks