* switch to go modules
* update vendor (go mod vendor)
* swithing to go mod: update docs and makefile
* update goget-tools
* use go mod verify to check vendor
* Update goget-tools
- pin goget-tools versions
- update gikgo to 1.14.0
- reset GOFLAGS for goget-tools
- fix ginkgo get for Prow
* go mod: replace github.com/kr/pty with github.com/creack/pty
* update vendor (go mod vendor)
* fix make cross target
-mod=vendor was not used for corss compiling