Improve python3 compatibility
Improve python3 compatibility

Change print statements so that it works with python3
as well.

Change-Id: Iff16b62e4b875c79862c9af7726ea77627aa7b4f
Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

eezhova/oslo.service,openstack/oslo.service,poznyakandrey/oslo.service,citrix-openstack-build/oslo.service