cfg: use a list comprehension instead of map()
cfg: use a list comprehension instead of map()

Change-Id: Iaccb71d83d957aae77fa0f6bc71952b899d3a159

emonty/oslo-packaging,citrix-openstack-build/pbr,JioCloud/pbr,openstack-dev/pbr,JioCloud/pbr,citrix-openstack-build/pbr,WiFast/pbr,varunarya10/pbr,WiFast/pbr,citrix-openstack-build/pbr,openstack-dev/pbr,klmitch/pbr,redhat-openstack/pbr,varunarya10/pbr,openstack-dev/pbr,klmitch/pbr,redhat-openstack/pbr,emonty/oslo-packaging