Add oslo_concurrency=INFO to default log levels for nova-manage
Add oslo_concurrency=INFO to default log levels for nova-manage

We currently get oslo_concurrency logging at DEBUG level which
is gratuitous, so this changes the default to INFO.

Closes-Bug: #1707001

Change-Id: Iacf0a94296dbd44d0f30650003b732baccd3728b

klmitch/nova,gooddata/openstack-nova,mikalstill/nova,phenoxim/nova,phenoxim/nova,klmitch/nova,klmitch/nova,vmturbo/nova,mahak/nova,gooddata/openstack-nova,klmitch/nova,mikalstill/nova,vmturbo/nova,gooddata/openstack-nova,mikalstill/nova,jianghuaw/nova,vmturbo/nova,jianghuaw/nova,jianghuaw/nova,vmturbo/nova,gooddata/openstack-nova,openstack/nova,openstack/nova,jianghuaw/nova,rahulunair/nova,rahulunair/nova,mahak/nova,openstack/nova,mahak/nova,rahulunair/nova