Refactor unit tests to us a fake logging class

[Chuck Thier]

Running the unit tests creates a *lot* of logs. As we add more tests, it also happens to break a default install of syslog-ng due to running out of connections. It would be nice if we could use a fake logging class for tests so no real logs would be generated, and not require a logging system to be installed to just run unit tests.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/7023

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/7023
Committed: http://github.com/openstack/swift/commit/f7fdb9cf12585b104a6ffabaadbc2d3a3b0b019f
Submitter: Jenkins
Branch: master

commit f7fdb9cf12585b104a6ffabaadbc2d3a3b0b019f
Author: Dan Dillinger <email address hidden>
Date: Mon Apr 30 16:38:15 2012 -0400

    Implement unit_test config to disable syslog.

    bug 701248
    bug 819303

    This change makes syslog optional, by providing a unit test
    config with the ability to cause test/unit/__init__.py to
    replace SysLogHandler with a fake logging class. The
    default behavior is unchanged.

    FakeLogger now inherits directly from Handler and mocks out
    its API - this was a backward-compatibility issue.

    Change-Id: I653dec148c4f6cf81759de03964c6a3290c1a290