An option to update coord properties/definition

To change the coord definition user can update coord definition in hdfs and issue a update command. Existing coordinator definition will be replaced by new definition. The refreshed coordinator
would keep the same coordinator ID, state, and coordinator actions.

User can also provide -dryrun to validate changes.
All created coord action(including in waiting) will use old configuration.
User can rerun actions with -refresh option, -refresh option will use new configuration to rerun coord action.

Ex.
1. $ oozie job -update <coordID> -config examples/apps/aggregator/job.properties
Will update coord definition and action.

2. $ oozie job -update <coordID>
Will fetch coord definition path from bundle and update coord definition