vstart: put .journal outside of osd data dir
vstart: put .journal outside of osd data dir

This prevents it from getting cleaned up during mkfs.  Then we can make it
a symlink, or at the very least avoid deleting + reallocating it.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph