This is to just catch possible breakage in the future. The actual
support was done in Gophercloud.
Previously, values of 0 were not allowed since there's no such port
as 0. However, there are ICMP codes of 0.
This commit fixes an issue with security group rules where the rules
were not being correctly computed due to a typo in the rule map.
Once rules were successfully computed, the rules then needed to be
converted into a Set so they can be correctly ordered.