Publish diagnostic if IP address of EXPOSE is invalid

[rcjsuen]

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The Docker builder will create an error if the IP address of an EXPOSE instruction is invalid. We should publish a diagnostic for this same error.

FROM scratch
EXPOSE 8080::8081

$ docker build .
Sending build context to Docker daemon  86.15MB
Step 1/2 : FROM scratch
 --->
Step 2/2 : EXPOSE 8080::8081
Invalid ip address: 8080