Sort stream service ports to avoid extra reloads

[ajwdev]

This fixes a bug where an Ingress controller would continuously reload its configuration if multiple TCP/UDP stream services were specified. This is caused by the list of ports not being sorted.

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[k8s-reviewable]

This change is 

[coveralls]

Coverage increased (+0.02%) to 46.145% when pulling bc96000 on williamsandrew:sort-upstream-ports into 5ab0f28 on kubernetes:master.

[aledbf]

@williamsandrew please sign the CLA

[ajwdev]

Sorry for the delay. CLA should be good now

[aledbf]

@williamsandrew closing. The stream section is different now.