Add delete_account in InternalClient

Currently, The internal client module is missing a delete_account method.
I added a delete_account in InternalClient

Change-Id: I97cb090820b4099944ba49eaeb5b02f9bbcf1d58
Closes-Bug: #1680377

swift/common/internal_client.py

@@ -384,6 +384,21 @@ class InternalClient(object):
         return self._iter_items(path, marker, end_marker, prefix,
                                 acceptable_statuses)
 
+    def delete_account(self, account, acceptable_statuses=(2, HTTP_NOT_FOUND)):
+        """
+        Deletes an account.
+
+        :param account: Account to delete.
+        :param acceptable_statuses: List of status for valid responses,
+                                    defaults to (2, HTTP_NOT_FOUND).
+        :raises UnexpectedResponse: Exception raised when requests fail
+                                    to get a response with an acceptable status
+        :raises Exception: Exception is raised when code fails in an
+                           unexpected way.
+        """
+        path = self.make_path(account)
+        self.make_request('DELETE', path, {}, acceptable_statuses)
+
     def get_account_info(
             self, account, acceptable_statuses=(2, HTTP_NOT_FOUND)):
         """

test/unit/common/test_internal_client.py

@@ -940,6 +940,14 @@ class TestInternalClient(unittest.TestCase):
             ret_items.append(container)
         self.assertEqual(items, ret_items)
 
+    def test_delete_account(self):
+        account, container, obj = path_parts()
+        path = make_path_info(account)
+        client, app = get_client_app()
+        app.register('DELETE', path, swob.HTTPNoContent, {})
+        client.delete_account(account)
+        self.assertEqual(1, len(app._calls))
+
     def test_get_account_info(self):
         class Response(object):
             def __init__(self, containers, objects):