Ingress and egress rules given a "-1" protocol don't have ports when
Read out of AWS. This results in hashing problems, as a local
config file might contain port declarations AWS can't ever return.
Rather than making ports optional fields, which carries with it a huge
headache trying to distinguish between zero-value attributes (e.g.
'to_port = 0') and attributes that are simply omitted, simply force the
user to opt-in when using the "-1" protocol. If they choose to use it,
they must now specify "0" for both to_port and from_port. Any other
configuration will error.
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