Tidy up

- Ran goimports to format code and imports
- Removed unused module from go.mod
- Added .editorconfig to keep formatting standard across contributors

internal/app/wwctl/node/set/main.go

@@ -2,6 +2,8 @@ package set
 
 import (
 	"fmt"
+	"os"
+
 	"github.com/hpcng/warewulf/internal/pkg/container"
 	"github.com/hpcng/warewulf/internal/pkg/node"
 	"github.com/hpcng/warewulf/internal/pkg/util"
@@ -9,7 +11,6 @@ import (
 	"github.com/hpcng/warewulf/internal/pkg/wwlog"
 	"github.com/manifoldco/promptui"
 	"github.com/spf13/cobra"
-	"os"
 )
 
 func CobraRunE(cmd *cobra.Command, args []string) error {