multimds: factor install+ceph tasks out of other collections

Signed-off-by: Sage Weil <sage@inktank.com>
multimds: fuse_default_permissions = 0

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #34 from ceph/wip-fuse

fuse_defautl_permissions = 0;

Reviewed-by: Greg Farnum <greg@inktank.com>