Use secure sha256 instead of sha1

Fix for bandit B303: Use of insecure MD2, MD4, MD5, or SHA1 hash function.

Change-Id: I00403d7bd3b40ae00420e6cddcf40f45488284a9
Partial-Bug: #1759250
(cherry picked from commit ab426a791a)
(cherry picked from commit 62f4868e6e)

neutronclient/common/utils.py

@@ -183,9 +183,9 @@ def http_log_req(_logger, args, kwargs):
     for (key, value) in six.iteritems(kwargs['headers']):
         if key in SENSITIVE_HEADERS:
             v = value.encode('utf-8')
-            h = hashlib.sha1(v)
+            h = hashlib.sha256(v)
             d = h.hexdigest()
-            value = "{SHA1}%s" % d
+            value = "{SHA256}%s" % d
         header = ' -H "%s: %s"' % (key, value)
         string_parts.append(header)