fix flake

Author: Aditi Sharma

tests/helper/helper_generic.go

@@ -176,11 +176,13 @@ func WatchNonRetCmdStdOut(cmdStr string, timeout time.Duration, success func(out
 // for commands like odo log -f which streams continuous data and does not terminate by their own
 // we need to read the stream data from buffer.
 func RunCmdWithMatchOutputFromBuffer(timeoutAfter time.Duration, matchString, program string, args ...string) (bool, error) {
-	var buf, errBuf bytes.Buffer
+
+	buf := bytes.NewBuffer(make([]byte, 0, 10))
+	errBuf := bytes.NewBuffer(make([]byte, 0, 10))
 
 	command := exec.Command(program, args...)
-	command.Stdout = &buf
-	command.Stderr = &errBuf
+	command.Stdout = buf
+	command.Stderr = errBuf
 
 	timeoutCh := time.After(timeoutAfter)
 	matchOutputCh := make(chan bool)
@@ -196,6 +198,8 @@ func RunCmdWithMatchOutputFromBuffer(timeoutAfter time.Duration, matchString, pr
 		return false, err
 	}
 
+	defer command.Process.Kill()
+
 	// go routine which is reading data from buffer until expected string matched
 	go func() {
 		for {