Docker is case sensitive about networks

[tomaratyn]

host/bridge/none must be lower case or will be treated as network names.

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[dgageot]

Thank you @tomaratyn for submitting this PR!

To make sure it is merged you need two things:

• First, you have to accept the CLA.
• Second, you should not edit the json schemas directly. Those files are generated from comments on go structs in the pkg/skaffold/schema folder. So you have to modify all the places where there are those typos, then run make generate-schemas and finally commit those changes and update your PR.

[dgageot]

Fixed with #2288. Thanks @tomaratyn for getting this started.