refactor: first pass at rewriting apps plugin in go

plugins/apps/vendor/github.com/codeskyblue/go-sh/OLD_README.md

@@ -0,0 +1,69 @@
+## OLD README
+First give you a full example, I will explain every command below.
+
+	session := sh.NewSession()
+	session.Env["PATH"] = "/usr/bin:/bin"
+	session.Stdout = os.Stdout
+	session.Stderr = os.Stderr
+	session.Alias("ll", "ls", "-l")
+	session.ShowCMD = true // enable for debug
+	var err error
+	err = session.Call("ll", "/")
+	if err != nil {
+		log.Fatal(err)
+	}
+	ret, err := session.Capture("pwd", sh.Dir("/home")) # wraper of session.Call
+	if err != nil {
+		log.Fatal(err)
+	}
+	# ret is "/home\n"
+	fmt.Println(ret)
+
+create a new Session
+
+	session := sh.NewSession()
+
+use alias like this
+
+	session.Alias("ll", "ls", "-l") # like alias ll='ls -l'
+
+set current env like this
+
+	session.Env["BUILD_ID"] = "123" # like export BUILD_ID=123
+
+set current directory
+
+	session.Set(sh.Dir("/")) # like cd /
+
+pipe is also supported
+
+	session.Command("echo", "hello\tworld").Command("cut", "-f2")
+	// output should be "world"
+	session.Run()
+
+test, the build in command support
+
+	session.Test("d", "dir") // test dir
+	session.Test("f", "file) // test regular file
+
+with `Alias Env Set Call Capture Command` a shell scripts can be easily converted into golang program. below is a shell script.
+
+	#!/bin/bash -
+	#
+	export PATH=/usr/bin:/bin
+	alias ll='ls -l'
+	cd /usr
+	if test -d "local"
+	then
+		ll local | awk '{print $1, $NF}'
+	fi
+
+convert to golang, will be
+
+	s := sh.NewSession()
+	s.Env["PATH"] = "/usr/bin:/bin"
+	s.Set(sh.Dir("/usr"))
+	s.Alias("ll", "ls", "-l")
+	if s.Test("d", "local") {
+		s.Command("ll", "local").Command("awk", "{print $1, $NF}").Run()
+	}