* Fix the intermittent TestGPGGit failures

Reattempt to open the listener if the port is busy with a delay up to a second
Switch from generating a private key each time, just use a known good key

* update swagger to 0.20.1

* fiw swagger version for validate

* update gopkg.in/src-d/go-git.v4 v4.13.0

* mod tidy

* vendor

* Migrate to go modules

* make vendor

* Update mvdan.cc/xurls

* make vendor

* Update code.gitea.io/git

* make fmt-check

* Update github.com/go-sql-driver/mysql

* make vendor