use go mod

[houz42]

and monor fixes to pass go lint checkings

[doubletao318]

1. Thank you so much for your efforts. But we need to try this with our own env.
2. The versions of the 3rd packages may not meet our requirements and need to be reviewed.
3. There are some conflicts.

[houz42]

@doubletao318 Conflects fixed, and thanks for your patient.

And yes, as there was no any requirements configuration file as descripted in the go mod init doc, there must be some differencies between the versions of the 3rd party packages. And it should be tested carefully. Hopefully, we have tried with no suprise.