Add E2E test of bsl deletion

Signed-off-by: danfengl <danfengl@vmware.com>

test/e2e/util/common/common.go

@@ -0,0 +1,54 @@
+package common
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"os/exec"
+)
+
+type OsCommandLine struct {
+	Cmd  string
+	Args []string
+}
+
+func GetListBy2Pipes(ctx context.Context, cmdline1, cmdline2, cmdline3 OsCommandLine) ([]string, error) {
+	var b2 bytes.Buffer
+	var errVelero, errAwk error
+
+	c1 := exec.CommandContext(ctx, cmdline1.Cmd, cmdline1.Args...)
+	c2 := exec.Command(cmdline2.Cmd, cmdline2.Args...)
+	c3 := exec.Command(cmdline3.Cmd, cmdline3.Args...)
+	fmt.Println(c1)
+	fmt.Println(c2)
+	fmt.Println(c3)
+	c2.Stdin, errVelero = c1.StdoutPipe()
+	if errVelero != nil {
+		return nil, errVelero
+	}
+	c3.Stdin, errAwk = c2.StdoutPipe()
+	if errAwk != nil {
+		return nil, errAwk
+	}
+	c3.Stdout = &b2
+	_ = c3.Start()
+	_ = c2.Start()
+	_ = c1.Run()
+	_ = c2.Wait()
+	_ = c3.Wait()
+
+	fmt.Println(&b2)
+	scanner := bufio.NewScanner(&b2)
+	var ret []string
+	for scanner.Scan() {
+		fmt.Printf("line: %s\n", scanner.Text())
+		ret = append(ret, scanner.Text())
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}