Fix loglevel set up for Openstack services

Invalid Jinja2 statement used in
oslo_templates/files/logging/_logging.conf
It returns empty value for 'app_name' Jinja2 variable
substiution, so default level 'INFO'
has been always applied for logger_<app_name>, which
prevented from actual loglevel changing for Openstack daemons
which use oslo lib for logging.

Change-Id: Ia1ed5266e550cbd334d88c8c2d07f232bcb3ea89
Closes-Bug: PROD-26269
1 file changed