fix(dev-server): delete lazy and filename options

[hiroppy]

Don't merge.

Delete lazy and filename options because webpack-dev-middleware won't support them.

Related PR: webpack/webpack-dev-server#2544

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[EugeneHlushko]

@hiroppy its been in "do not merge" for a while now, any updates? :)

[alexander-akait]

@EugeneHlushko We should merge it after v4 release (hope the next week)

[alexander-akait]

On hold

[chenxsan]

Closed via #4950