Remove utils.deprecated functions.
Remove utils.deprecated functions.

We don't seem to use utils.deprecated at all... so lets
remove it and save ourselves 200 lines of code.

Also moves a couple misc. test cases in utils.py out of the
DeprecationTest suite and into the GenericUtilsTestCase
suite.

Change-Id: I03f71f2ee06a526a8902a3079257afd6fd65dc59

openstack/oslo.versionedobjects,citrix-openstack-build/oslo.versionedobjects