actually use normalizeNetworkNames to produce valid network names

[exokortex]

Currently kompose does not normalize network names, which can lead to networks containing invalid characters for Kubernetes NetworkPolicy resources. There already was a function for this in pkg/loader/compose/utils.go, but it was not used.

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[exokortex]

/help

[hangyan]

not related go module error, will fix it after merged this PR

[hangyan]

Thanks @exokortex