Remove old build tag comments

Go is transitioning from the old '// +build' form to '//go:build', this
removes all uses of the old form, adding the new one where needed.

See https://go.googlesource.com/proposal/+/master/design/draft-gobuild.md

cmd/osbuild-auth-tests/certificates.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package main
 

cmd/osbuild-auth-tests/main_test.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package main
 

cmd/osbuild-composer-dbjobqueue-tests/main_test.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package main
 

cmd/osbuild-composer-manifest-tests/main_test.go

@@ -1,4 +1,4 @@
-// +build integration
+//go:build integration
 
 package main
 

cmd/osbuild-dnf-json-tests/main_test.go

@@ -1,7 +1,6 @@
 // This package contains tests related to dnf-json and rpmmd package.
 
 //go:build integration
-// +build integration
 
 package main
 

cmd/osbuild-image-tests/constants/constants.go

@@ -1,4 +1,4 @@
-// +build integration
+//go:build integration
 
 package constants
 

cmd/osbuild-image-tests/main_test.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package main
 

cmd/osbuild-koji-tests/main_test.go

@@ -4,7 +4,6 @@
 // koji.sh test because it needs a working Koji instance to pass.
 
 //go:build integration
-// +build integration
 
 package main
 

cmd/osbuild-service-maintenance/db_test.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package main
 

internal/boot/aws.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package boot
 

internal/boot/azuretest/azure.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package azuretest
 

internal/boot/azuretest/deployment.go

@@ -1,4 +1,4 @@
-// +build integration
+//go:build integration
 
 package azuretest
 

internal/boot/context-managers.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package boot
 

internal/boot/helpers.go

@@ -1,4 +1,4 @@
-// +build integration
+//go:build integration
 
 package boot
 

internal/boot/netns.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package boot
 

internal/boot/openstacktest/openstack.go

@@ -1,4 +1,4 @@
-// +build integration
+//go:build integration
 
 package openstacktest
 

internal/boot/vmwaretest/vmware.go

@@ -1,5 +1,4 @@
 //go:build integration
-// +build integration
 
 package vmwaretest
 

internal/client/integration_test.go

@@ -2,7 +2,6 @@
 // Copyright (C) 2020 by Red Hat, Inc.
 
 //go:build integration
-// +build integration
 
 package client
 

internal/client/unit_test.go

@@ -2,7 +2,6 @@
 // Copyright (C) 2020 by Red Hat, Inc.
 
 //go:build !integration
-// +build !integration
 
 package client
 

internal/crypt/crypt_impl.go

@@ -1,5 +1,4 @@
 //go:build !darwin
-// +build !darwin
 
 // Copied from https://github.com/amoghe/go-crypt/blob/b3e291286513a0c993f7c4dd7060d327d2d56143/crypt_r.go
 // Original sources are under MIT license:

internal/crypt/crypt_impl_macos.go

@@ -1,5 +1,4 @@
 //go:build darwin
-// +build darwin
 
 package crypt
 

internal/crypt/crypt_test.go

@@ -1,5 +1,4 @@
 //go:build !darwin
-// +build !darwin
 
 package crypt
 

internal/tools.go

@@ -1,4 +1,4 @@
-// +build tools
+//go:build tools
 
 // This file is here to just explicitly tell `go mod vendor` that we depend
 // on oapi-codegen. Without this file, `go generate ./...` in Go >= 1.14 gets