Joshua Harlow aa8be4b8f5 Use the ability to chain exceptions correctly ...

In the zookeeper jobboard (and persistence backends) we
are associating the cause of a new exception when raising a
exception. Using the new exception helper we can make this
work better on py2.x and py3.x so that the py3.x version
has the chain setup correctly (while the py2.x version just
uses the class 'cause' attribute instead).

Change-Id: Ieeac2f70e1834d4612556565762ffd3be3e5b5a1

2015-04-03 16:04:46 -07:00

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