Description of problem:
-----------------------
Similar like in bz 1507863

UC's minor update fails
...
2017-11-06 08:09:04 - Notice: /Stage[main]/Keepalived::Service/Service[keepalived]: Triggered 'refresh' from 1 events
2017-11-06 08:09:05 - Notice: /Stage[main]/Mistral::Db::Sync/Exec[mistral-db-sync]/returns: executed successfully
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns: Option "rpc_backend" from group "DEFAULT" is deprecated for removal.  Its value may be silently ignored in the future.
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns: Traceback (most recent call last):
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/bin/ironic-dbsync", line 10, in <module>
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     sys.exit(main())
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib/python2.7/site-packages/ironic/cmd/dbsync.py", line 102, in main
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     service.prepare_service(sys.argv)
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib/python2.7/site-packages/ironic/common/service.py", line 47, in prepare_service
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     log.setup(CONF, 'ironic')
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib/python2.7/site-packages/oslo_log/log.py", line 269, in setup
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     _setup_logging_from_conf(conf, product_name, version)
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib/python2.7/site-packages/oslo_log/log.py", line 366, in _setup_logging_from_conf
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     filelog = file_handler(logpath)
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib64/python2.7/logging/handlers.py", line 392, in __init__
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     logging.FileHandler.__init__(self, filename, mode, encoding, delay)
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib64/python2.7/logging/__init__.py", line 902, in __init__
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     StreamHandler.__init__(self, self._open())
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:   File "/usr/lib64/python2.7/logging/__init__.py", line 925, in _open
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns:     stream = open(self.baseFilename, self.mode)
2017-11-06 08:10:03 - Notice: /Stage[main]/Ironic::Db::Sync/Exec[ironic-dbsync]/returns: IOError: [Errno 13] Permission denied: '/var/log/ironic/ironic-dbsync.log'
2017-11-06 08:10:03 - Error: ironic-dbsync --config-file /etc/ironic/ironic.conf  returned 1 instead of one of [0]


Version-Release number of selected component (if applicable):
-------------------------------------------------------------
openstack-ironic-conductor-6.2.4-2.el7ost.noarch
python-ironicclient-1.7.1-1.el7ost.noarch
openstack-ironic-common-6.2.4-2.el7ost.noarch
python-ironic-lib-2.1.3-1.el7ost.noarch
puppet-ironic-9.5.0-2.el7ost.noarch
openstack-ironic-api-6.2.4-2.el7ost.noarch
openstack-ironic-inspector-4.2.2-3.el7ost.noarch
python-ironic-inspector-client-1.10.0-1.el7ost.noarch


Steps to Reproduce:
-------------------
1. Deploy RHOS-10 env
2. Setup latest repos(z6) on UC
3. Follow update procedure

Actual results:
---------------
UC update fails


Expected results:
-----------------
UC update succeeds 

Additional info:
----------------
/var/log/ironic/ironic-dbsync.log is owned by root:root
Having patch 517356 doesn't eliminate issue.
Removing file before update helps.