monitor velero logs and fix E2E issues

1. Capture Velero pod log and K8S cluster event;
2. Fix wrong path of storageclass yaml file issue caused by pert test;
3. Fix change storageclass test issue that no sc named 'default' in EKS cluster;
4. Support AWS credential as config format;
5. Support more E2E script input parameters like standy cluster plugins and provider.

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

test/util/common/common.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"os"
 	"os/exec"
 )
 
@@ -87,3 +88,25 @@ func CMDExecWithOutput(checkCMD *exec.Cmd) (*[]byte, error) {
 	}
 	return &jsonBuf, err
 }
+
+func WriteToFile(content, fileName string) error {
+	file, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE, 0666)
+	if err != nil {
+		fmt.Println("fail to open file", err)
+		return err
+	}
+	defer file.Close()
+
+	write := bufio.NewWriter(file)
+	_, err = write.WriteString(content)
+	if err != nil {
+		fmt.Println("fail to WriteString file", err)
+		return err
+	}
+	err = write.Flush()
+	if err != nil {
+		fmt.Println("fail to Flush file", err)
+		return err
+	}
+	return nil
+}