lacking complete logging setting options in quantum.conf

[yong sheng gong]

besides of the verbose and debug, we have more logging settings which should be put into quantum.conf so that users can configure it conveniently.
[DEFAULT]
# Default log level is WARNING
# Show more verbose log output (sets INFO log level output)
# verbose = False

# Show debugging output in logs (sets DEBUG log level output)
# debug = False

# log_format = %(asctime)s %(levelname)8s [%(name)s] %(message)s
# log_date_format = %Y-%m-%d %H:%M:%S

# use_syslog = False
# syslog_log_facility = LOG_USER

# if use_syslog is False, we can set log_file and log_dir.
# if use_syslog is False and we do not set log_file,
# the log will be printed to stdout.
# log_file =
# log_dir =

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/13690

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/13690
Committed: http://github.com/openstack/quantum/commit/28eb0bf5b3ca7f3e849c5781e82b5cf03ed7d95e
Submitter: Jenkins
Branch: master

commit 28eb0bf5b3ca7f3e849c5781e82b5cf03ed7d95e
Author: gongysh <email address hidden>
Date: Wed Sep 26 12:17:09 2012 +0800

    Add log setting options into quantum.conf.

    Bug #1056584

    This will improve the user experiences.

    Change-Id: Iaafd4eeb4fc23c5473276b3cf0e5ccffe2150ec2