Don't use pecan to configure logging

Fixes bug #1184941

openstack.common.log gives a mechanism to configure logging and, by
default, we will set up a handler on root logger. Using pecan to also
configure a handler on the 'ironic' logger means every log message gets
logged to console twice.

It seems that the pecan logging configuration stuff is redundant with
our existing logging configuration infrastructure.

Change-Id: Iec0630b0e842e3b6a90021bf552d9b857c5a0552
Merge "Don't use pecan to configure logging"