Add per policy container count to account stat output

When the account response includes 'X-Storage-Policy-X-Container-Count' the
command helpers will stick a helpful extra line in the output.

If the swift response doesn't include the information the behavior is
unchanged.

Change-Id: Iaaa55d207ebe6a9c16e52adb56eb858c57cfb26a

swiftclient/command_helpers.py

@@ -45,6 +45,14 @@ def stat_account(conn, options):
             policies.add(policy_name)
 
     for policy in policies:
+        container_count_header = (POLICY_HEADER_PREFIX + policy +
+                                  '-container-count')
+        if container_count_header in headers:
+            items.append(
+                ('Containers in policy "' + policy + '"',
+                 prt_bytes(headers[container_count_header],
+                           options['human']).lstrip())
+            )
         items.extend((
             ('Objects in policy "' + policy + '"',
              prt_bytes(

tests/unit/test_command_helpers.py

@@ -124,6 +124,32 @@ Objects in policy "nada": 1000000
 """
         self.assertOut(expected)
 
+    def test_stat_account_policy_stat_with_container_counts(self):
+        # stub head_account
+        stub_headers = {
+            'x-account-container-count': 42,
+            'x-account-object-count': 1000000,
+            'x-account-bytes-used': 2 ** 30,
+            'x-account-storage-policy-nada-container-count': 10,
+            'x-account-storage-policy-nada-object-count': 1000000,
+            'x-account-storage-policy-nada-bytes-used': 2 ** 30,
+        }
+        self.conn.head_account.return_value = stub_headers
+
+        with self.output_manager as output_manager:
+            items, headers = h.stat_account(self.conn, self.options)
+            h.print_account_stats(items, headers, output_manager)
+        expected = """
+                    Account: a
+                 Containers: 42
+                    Objects: 1000000
+                      Bytes: 1073741824
+Containers in policy "nada": 10
+   Objects in policy "nada": 1000000
+     Bytes in policy "nada": 1073741824
+"""
+        self.assertOut(expected)
+
     def test_stat_container_human(self):
         self.options['human'] = True
         # stub head container request