fix: failed to create the systemd experiment

[Yuaninga]

Signed-off-by: Yuaninga 1846225041@qq.com

Describe what this PR does / why we need it

This PR will fix the bug: failed to create the systemd experiment.

Does this pull request fix one issue?

bug report： the systemd stop experiment cannot be created #815

Describe how you did it

TheStopSystemdBin will be no longer used in the code, but systemctl stop service that realized the StopSystemdBin will be used directly.

Describe how to verify it

1.Build a new chaos_os in the chaosblade-exec-os

cd chaosblade-exec-os
make build_linux (on the Mac operating system)
cd target/chaosblade-1.7.0/bin

2.Move the new chaos_os to the chaosblade-1.7.0 from the chaosblade-exec-os

scp chaos_os root@x.x.x.x:/root/chaosblade-1.7.0

3.Replace the old chaos_os

ssh root@x.x.x.x
cd chaosblade-1.7.0/bin
mv chaos_os chaos_os_old
cd ..
mv chaos_os bin/chaos_os

4.Create the systemd experiment

systemctl start test
systemctl status test
cd chaosblade-1.7.0
./blade create systemd stop --service test

Special notes for reviews

Create the test service managed by the systemd:

1.test.go

package main
import (
        "time"
        "os"
)
func main(){

        f,err := os.OpenFile("./out.log",os.O_CREATE| os.O_APPEND|os.O_WRONLY,0600)
        if err != nil {
                        return
        }
        for i := 0; i < 10000; i++{
                str := string(time.Now().String())  +string("I am ok\n")
                _,err := f.WriteString(str )
                if err != nil {
                        return
                }
                time.Sleep(time.Second * 5)
        }
}

2.test.service

[Unit]
Description=test
After=network.target

[Service]
Type=simple
Restart=always
RestartSec=1
User=root
ExecStart=/root/deamon/test

[Install]
WantedBy=multi-user.target

3.move test.service

mv test.service /usr/lib/systemd/system