Use Go1.11 module (#5743)

* 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

vendor/github.com/kevinburke/ssh_config/.travis.yml

@@ -0,0 +1,15 @@
+go_import_path: github.com/kevinburke/ssh_config
+
+language: go
+
+go:
+  - 1.9.x
+  - 1.10.x
+  - 1.11.x
+  - master
+
+before_script:
+    - go get -u ./...
+
+script:
+    - make race-test