Use different method to compute ServicePort.repr Workaround for https://bugs.python.org/issue24931
Use different method to compute ServicePort.repr
Workaround for https://bugs.python.org/issue24931

Signed-off-by: Joffrey F <2e95f49799afcec0080c0aeb8813776d949e0768@docker.com>

shin-/compose,funkyfuture/docker-compose,hoogenm/compose,sdurrheimer/compose,swoopla/compose,shin-/compose,dnephin/compose,dnephin/compose,vdemeester/compose,vdemeester/compose,schmunk42/compose,jrabbit/compose,funkyfuture/docker-compose,thaJeztah/compose,thaJeztah/compose,jrabbit/compose,sdurrheimer/compose,hoogenm/compose,swoopla/compose,schmunk42/compose