Replace flag handling with alecthomas/kong.

[ChriMarMe]

Reopen for review. will rebase on main and adapt accordingly.

[ChriMarMe]

This is much more convenient than using FlagSets and implementing all the support for the same functionality.

[ChriMarMe]

Last thing I need to move the Config struct to vmm and hopefully be done with it.

[ChriMarMe]

fails because coverage goes down by 3 %. Will fix tomorrow

[ChriMarMe]

-5% test coverage. no idea how to cope with it....

[ChriMarMe]

I placed the untestable code of kong (like the run functions of the command structs) into seperate file and made sure it is excluded from coverage until we find a better solution.

[ChriMarMe]

Coverage still under 82%. Dunno if i ever reach it again.

[ChriMarMe]

81%.....

[bobuhiro11]

If we can test that the proposal in this PR is working as expected in the CI, then we don't need to be concerned about the value of coverage itself 😄

[ChriMarMe]

Wrote seperate tests for start and debug command parsing.

[ChriMarMe]

Well....i hope it works now as intended.

[ChriMarMe]

bad response status from coveralls: 500

{"message":"Build processing error.","error":true,"url":""}

idk

[bobuhiro11]

https://app.travis-ci.com/github/bobuhiro11/gokvm/jobs/608550126 says The command "sudo -E env "PATH=$PATH" go mod tidy && git diff --no-patch --exit-code go.sum" exited with 1..

go mod tidy command would fix the CI.

[ChriMarMe]

Finally. Thanks for the hint to go mod tidy