Changes to work-item model

[brianparry]

This patch includes changes to the work-item model that are needed to remove serializables from the 2.0 API pollers route. Changes convert the pollers resource "type" property to "name" and redact passwords from poller config.

[houndci-bot]

Missing semicolon.

[JenkinsRHD]

*** BUILD #478 ***
Test Name: create_pollers
Error Details: {'password': 'admin', 'command': 'sdr', 'user': 'admin'} != {u'command': u'sdr', u'user': u'admin'}
Stack Trace: Traceback (most recent call last):
  File "/usr/lib/python2.7/unittest/case.py", line 331, in run
    testMethod()
  File "/usr/lib/python2.7/unittest/case.py", line 1043, in runTest
    self._testFunc()
  File "/tmp/.venv/local/lib/python2.7/site-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    compatability.capture_type_error(s_func)
  File "/tmp/.venv/local/lib/python2.7/site-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    func()
  File "/tmp/.venv/local/lib/python2.7/site-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/workspace/on-core/RackHD/test/tests/api/v2_0/pollers_tests.py", line 119, in create_pollers
    assert_equal(poller[key], data[key])
  File "/tmp/.venv/local/lib/python2.7/site-packages/proboscis/asserts.py", line 55, in assert_equal
    raise ASSERTION_ERROR(message)
AssertionError: {'password': 'admin', 'command': 'sdr', 'user': 'admin'} != {u'command': u'sdr', u'user': u'admin'}