Add support for Oozie coordinator to work in an UTC offset

Current Oozie coordinator expects and resolves dates in UTC (ie 2009-08-10T00:00Z). UTC datetimes are used for start/end/pause of jobs, datasets initial-instance and to resolve dataset instance URI templates.

Adding support for a non UTC timezone it would enable deployments where they use a timezone different than UTC as standard. This seems quite common in countries where they don't observe DST changes.