refactor: decrease compile time for golang plugins

This change refactors the compiled golang plugins into 3 distinct binaries:

- commands: already existing
- subcommands/subcommands: entrypoint into all subcommands
- triggers: entrypoint into all triggers

It then further symlinks triggers and subcommands to the built binaries. This results in both a much faster build process as well as smaller package size.

plugins/network/src/subcommands/subcommands.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/dokku/dokku/plugins/common"
+	"github.com/dokku/dokku/plugins/network"
+)
+
+// main entrypoint to all subcommands
+func main() {
+	parts := strings.Split(os.Args[0], "/")
+	subcommand := parts[len(parts)-1]
+	flag.Parse()
+
+	switch subcommand {
+	case "rebuild":
+		appName := flag.Arg(1)
+		network.BuildConfig(appName)
+	case "rebuildall":
+		network.CommandRebuildall()
+	case "report":
+		appName := flag.Arg(1)
+		infoFlag := flag.Arg(2)
+		network.CommandReport(appName, infoFlag)
+	case "set":
+		appName := flag.Arg(1)
+		property := flag.Arg(2)
+		value := flag.Arg(3)
+		network.CommandSet(appName, property, value)
+	default:
+		common.LogFail(fmt.Sprintf("Invalid plugin subcommand call: %s", subcommand))
+	}
+}