[oozie] Order coordinator actions on the Oozie side

https://github.com/cloudera/hue/pull/132

Oozie configuration can have 'oozie.coord.actions.default.length' parameter which overloads oozie 'len'
param, and Hue may not display latest coordinator actions if they are exceeding this value.
Since https://issues.apache.org/jira/browse/OOZIE-1754 oozie can sort coordinator actions.
We need to request oozie to sort coordinator actions in descending order and display them
correctly by dashboard.py.