fix(serve): pass devServer sockPath properly to client

[AlbertBrand]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Underlying tools
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

Other information:

When you change the devServer.sockPath setting, one of the required webpack-devserver-client ignores the sockPath setting. This is visible in your developer console: the local sockjs url connects but the network sockjs fails.

This is caused by incorrectly providing the sockPath to the webpack client. It infers the host and port from the provided URL parameter but not the sockPath, which has to be specified as an additional parameter. This PR removes the path part from the sockjsUrl (as it does nothing) and adds the sockPath as additional param.

[McPo]

Whats the normal release schedule for vue-cli, is there anything in particular that would trigger a patch release? As Id like to know how long I can expect until this fix is released.

Cheers,
Emmet

[sodatea]

Need to clean up some other stuff.

I'll ship a release (4.4.0, under the next dist-tag first) next Monday, and move it to latest around Wednesday.