The Batch command did not report errors correctly: it reported
the text of *all* errors, not just PublicError, used unicode(e)
instead of e.strerror (which results in incorrect i18n), and only
reported the text of error messages, not their type and code.
Fix these problems. Update tests.
https://fedorahosted.org/freeipa/ticket/2874https://fedorahosted.org/freeipa/ticket/2901
This adds tests for the batch plugin, and changes its output
declaration to allow results as tuples (this tripped validation).
The assert_deepequal function ignores the order of items in lists.
Document this in its docstring, and use a custom checker for the
batch plugin results.
