Update go to 1.18 - Githubissues

In GitHub workflow yamls, update go to 1.18 and golangci-lint to 1.45.2.
Update go.mod files to use go 1.18.
Replace deprecated linters: golint -> revive, scopelint -> exportloopref`.
Fix goheader linting rule configuration.
Fix linter issues introduced by the new golangci-lint version. * List tool dependencies in tools.go as recommended in the official go wiki, since installing tools via go get no longer works for go 1.18.

networkservicemesh / api