Build and Historic build updates

Modified GOPATH to not modify build with go.mod
Updated go.mod to version 1.12
Updated harness to setup listener before killing process
Updated notvendored flag to --no-vendor
Updated command_config to ensure no-vendor can be build
Added additional checks in source path lookup

revel/revel.go

@@ -91,6 +91,9 @@ func main() {
 		utils.InitLogger(wd, logger.LvlWarn)
 	}
 
+	// Setup package resolver
+	c.InitPackageResolver()
+
 	if err := c.UpdateImportPath(); err != nil {
 		utils.Logger.Error(err.Error())
 		parser.WriteHelp(os.Stdout)
@@ -100,12 +103,6 @@ func main() {
 	command := Commands[c.Index]
 	println("Revel executing:", command.Short)
 
-	// Setting go paths
-	// c.InitGoPaths()
-
-	// Setup package resolver
-	c.InitPackageResolver()
-
 	if err := command.RunWith(c); err != nil {
 		utils.Logger.Error("Unable to execute", "error", err)
 		os.Exit(1)