Duplicate issues MDEP-725 and MDEP-568

$ mvn -B dependency:go-offline  -DexcludeGroupIds=org.dojotoolkit -DexcludeClassifiers=distribution -DexcludeArtifactIds=org.dojotoolkit:dojo:zip:1.10.8,dojo -DexcludeTypes=zip

Results in attempted resolution of all of the excluded parameters. Looking at the GoOfflineMojo class, the filters were clearly never wired into the doExecute logic. This PR fixes that and adds some unit and integration tests.

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