Change Checkpoint default to true. Mesos already did so, we might as well also

[stevenschlansker]

No description provided.

[tpetr]

To enable this in a pre-existing cluster:

Changing FrameworkInfo (while keeping the FrameworkID) is not handled correctly by Mesos at the moment. This is what you currently need to do to propagate FrameworkInfo.checkpoint throughout the cluster.

--> Update FrameworkInfo inside your framework and re-register with master. (Old FrameworkInfo is still cached at master and slaves).
--> Failover the leading master. (New FrameworkInfo will be cached by new leading master).
--> Hard restart (kill slave and wipe meta data) your slave in batches.

The proper fix for this is tracked at: https://issues.apache.org/jira/browse/MESOS-703