imageTag truncated when private repo name contains port number

[acheaito]

Consider the image name
artifactorytest.mycompany.com:443/docker-virtual/image1
and the kustomization
`images:

• name: artifactorytest.mycompany.com:443/docker-virtual/image1
  newTag: v2019.1`

When I run kustomize build, it truncates the image name at the port number and applies the tag, resulting in artifactorytest.mycompany.com:v2019.1

Tested with kustomize 2.0.2

[Liujingfang1]

Should be fixed by #837