Stop using django-file-md5

Current qinling-dashboard uses django-file-md5
to calculate md5 of uploading file.
But this library has no license terms,
so it is better to stop using this.
This commit remove those parts using above.

Change-Id: Ibe79df0d9d2d583e773cef502e40d07fc3eaf6f8
Story: 2003456
Task:24716

qinling_dashboard/content/functions/forms.py

@@ -17,14 +17,14 @@ from django.urls import reverse
 
 from django.utils.translation import ugettext_lazy as _
 
-from django_file_md5 import calculate_md5
-
 from horizon import exceptions
 from horizon import forms
 from horizon import messages
 
 from qinling_dashboard import api
 
+from qinling_dashboard.utils import calculate_md5
+
 from qinling_dashboard import validators
 
 

qinling_dashboard/test/tests/content/test_functions.py

@@ -14,8 +14,6 @@ import copy
 
 from django.core.files import uploadedfile
 
-from django_file_md5 import calculate_md5
-
 from django.http import response
 
 from django.urls import reverse
@@ -25,6 +23,7 @@ from django.utils.http import urlunquote
 from qinling_dashboard import api
 from qinling_dashboard.content.functions import forms as project_fm
 from qinling_dashboard.test import helpers as test
+from qinling_dashboard.utils import calculate_md5
 
 import mock
 

qinling_dashboard/utils.py

@@ -13,11 +13,23 @@
 # This file is to be included for configuring application which relates
 # to orchestration(Heat) functions.
 
+import hashlib
 import json
 
 from django.utils.translation import pgettext_lazy
 
 
+def calculate_md5(target):
+    if not target:
+        return ''
+
+    md5 = hashlib.md5()
+    for chunk in target.chunks():
+        md5.update(chunk)
+
+    return md5.hexdigest()
+
+
 def convert_raw_input_to_api_format(value):
     if value == '':
         return None

requirements.txt

@@ -8,7 +8,6 @@
 #
 # PBR should always appear first
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-django-file-md5>=1.0.2
 python-qinlingclient>=1.1.0 # Apache-2.0
 
 # This will be installed from git in OpenStack CI if the job setting