Make FSMLoggerAdapter compatible with Python 2.6

Python 2.6 does not use new style classes in the logging
subsystem, but the super call requires the parent to be
a new style class.

This patch updates the code to use the old way of calling
parent's constructor.

Change-Id: Ia02a3b7174554f174ad84ec1e22f565e62b69c32
Signed-off-by: Martin Sivak <msivak@redhat.com>