osd: default to 3x replication

3x is the recommendation; it should be the default too.

Signed-off-by: Sage Weil <sage@inktank.com>
osdmaptool: fix cli tests for 3x

Signed-off-by: Sage Weil <sage@inktank.com>
crush/CrushCompiler: start with legacy tunables when compiling

Ensure that a crush file always compiled deterministically, even though
the default values for *new* maps has changed.

Signed-off-by: Sage Weil <sage@inktank.com>
crushtool: remove scary tunables messages

Signed-off-by: Sage Weil <sage@inktank.com>
crush/CrushCompiler: make current set of tunables 'safe'

We can reenable this error the next time we add new tunables.

Signed-off-by: Sage Weil <sage@inktank.com>
Merge remote-tracking branch 'gh/wip-fix-tunables'

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Merge remote-tracking branch 'gh/wip-fix-3x'

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Merge git://github.com/ceph/ceph