Added test cases in ConfKeyManagerTestCase to verify fixed_key.

ConfKeyManagerTestCase sets the fixed_key option, but does not
perform checks to verify it was used.  This patch adds the
appropriate unit test cases to verify the fixed_key option.

Change-Id: I686b095eeb86b67271dc0e3cb5b6acd5a24d3d03
Closes-Bug: #1226228
Fix up import of conductor

Need to import API from nova.conductor not from nova.conductor.api
directly. This is needed so the is_local flag can be used to
determine the conductor API to use (local or rpc)

Change-Id: I9a45a705a39050b296936edc486db5c2f0aae4dc
Closes-Bug: #1308811
Merge "Fix up import of conductor"
Merge "Added test cases in ConfKeyManagerTestCase to verify fixed_key."