Adding init command

Author: JustMaris

plugins/terraform/terraform.go

@@ -26,6 +26,7 @@ func TerraformCLI() schema.Executable {
 				Optional: true,
 				NeedsAuth: needsauth.IfAny(
 					needsauth.ForCommand("refresh"),
+					needsauth.ForCommand("init"),
 					needsauth.ForCommand("plan"),
 					needsauth.ForCommand("apply"),
 					needsauth.ForCommand("destroy"),