Pylint fixing base_could_client,acloud_main,avd and common_operations.

- fix pylint errors
- Add some pylint disable comments to avoid pylint error temporarily

Bug: None
Test: run pylint
Change-Id: Ibf2ca67631d540cb6dc8d2fa463225cb52860a1e
diff --git a/public/actions/common_operations_test.py b/public/actions/common_operations_test.py
index 87a1227..91fcbd6 100644
--- a/public/actions/common_operations_test.py
+++ b/public/actions/common_operations_test.py
@@ -13,16 +13,15 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 """Tests for acloud.public.actions.common_operations."""
 
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
+import unittest
 import mock
 
-import unittest
 from acloud.internal.lib import android_build_client
 from acloud.internal.lib import android_compute_client
 from acloud.internal.lib import auth
@@ -32,61 +31,67 @@
 
 
 class CommonOperationsTest(driver_test_lib.BaseDriverTest):
+    """Test Common Operations."""
+    IP = "127.0.0.1"
+    INSTANCE = "fake-instance"
+    CMD = "test-cmd"
 
-  IP = "127.0.0.1"
-  INSTANCE = "fake-instance"
-  CMD = "test-cmd"
+    def setUp(self):
+        """Set up the test."""
+        super(CommonOperationsTest, self).setUp()
+        self.build_client = mock.MagicMock()
+        self.device_factory = mock.MagicMock()
+        self.Patch(
+            android_build_client,
+            "AndroidBuildClient",
+            return_value=self.build_client)
+        self.compute_client = mock.MagicMock()
+        self.Patch(
+            android_compute_client,
+            "AndroidComputeClient",
+            return_value=self.compute_client)
+        self.Patch(auth, "CreateCredentials", return_value=mock.MagicMock())
+        self.Patch(self.compute_client, "GetInstanceIP", return_value=self.IP)
+        self.Patch(
+            self.device_factory, "CreateInstance", return_value=self.INSTANCE)
+        self.Patch(
+            self.device_factory,
+            "GetComputeClient",
+            return_value=self.compute_client)
 
-  def setUp(self):
-    """Set up the test."""
-    super(CommonOperationsTest, self).setUp()
-    self.build_client = mock.MagicMock()
-    self.device_factory = mock.MagicMock()
-    self.Patch(
-        android_build_client,
-        "AndroidBuildClient",
-        return_value=self.build_client)
-    self.compute_client = mock.MagicMock()
-    self.Patch(
-        android_compute_client,
-        "AndroidComputeClient",
-        return_value=self.compute_client)
-    self.Patch(auth, "CreateCredentials", return_value=mock.MagicMock())
-    self.Patch(self.compute_client, "GetInstanceIP", return_value=self.IP)
-    self.Patch(
-        self.device_factory, "CreateInstance", return_value=self.INSTANCE)
-    self.Patch(self.device_factory, "GetComputeClient",
-               return_value=self.compute_client)
+    @staticmethod
+    def _CreateCfg():
+        """A helper method that creates a mock configuration object."""
+        cfg = mock.MagicMock()
+        cfg.service_account_name = "fake@service.com"
+        cfg.service_account_private_key_path = "/fake/path/to/key"
+        cfg.zone = "fake_zone"
+        cfg.disk_image_name = "fake_image.tar.gz"
+        cfg.disk_image_mime_type = "fake/type"
+        cfg.ssh_private_key_path = ""
+        cfg.ssh_public_key_path = ""
+        return cfg
 
-  def _CreateCfg(self):
-    """A helper method that creates a mock configuration object."""
-    cfg = mock.MagicMock()
-    cfg.service_account_name = "fake@service.com"
-    cfg.service_account_private_key_path = "/fake/path/to/key"
-    cfg.zone = "fake_zone"
-    cfg.disk_image_name = "fake_image.tar.gz"
-    cfg.disk_image_mime_type = "fake/type"
-    cfg.ssh_private_key_path = ""
-    cfg.ssh_public_key_path = ""
-    return cfg
+    def testDevicePoolCreateDevices(self):
+        """Test Device Pool Create Devices."""
+        pool = common_operations.DevicePool(self.device_factory)
+        pool.CreateDevices(5)
+        self.assertEqual(self.device_factory.CreateInstance.call_count, 5)
+        self.assertEqual(len(pool.devices), 5)
 
-  def testDevicePoolCreateDevices(self):
-    pool = common_operations.DevicePool(self.device_factory)
-    pool.CreateDevices(5)
-    self.assertEqual(self.device_factory.CreateInstance.call_count, 5)
-    self.assertEqual(len(pool.devices), 5)
-
-  def testCreateDevices(self):
-    cfg = self._CreateCfg()
-    r = common_operations.CreateDevices(self.CMD, cfg, self.device_factory, 1)
-    self.assertEqual(r.command, self.CMD)
-    self.assertEqual(r.status, report.Status.SUCCESS)
-    self.assertEqual(
-        r.data, {"devices": [{
-            "ip": self.IP,
-            "instance_name": self.INSTANCE
-        }]})
+    def testCreateDevices(self):
+        """Test Create Devices."""
+        cfg = self._CreateCfg()
+        _report = common_operations.CreateDevices(self.CMD, cfg, self.device_factory, 1)
+        self.assertEqual(_report.command, self.CMD)
+        self.assertEqual(_report.status, report.Status.SUCCESS)
+        self.assertEqual(
+            _report.data,
+            {"devices": [{
+                "ip": self.IP,
+                "instance_name": self.INSTANCE
+            }]})
 
 
 if __name__ == "__main__":
-  unittest.main()
+    unittest.main()