Fix various pylint violations

+ SchedUtils.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ VatHistory.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ VppCounters.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ Memif.py:
++ Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Either all return statements in a function should return an expression,
   or none of them should.
++ Update :return: on possible None.
+ Classify.py: Unnecessary "else" after "return"
+ ContainerUtils.py: Useless super delegation in method '__init__'
+ CpuUtils.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ DropRateSearch.py: Either all return statements in a function
  should return an expression, or none of them should.
+ IPv4NodeAddress.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Also improve docstrings.
+ IPv4Setup.py: Useless super delegation in method '__init__'
+ IPv6Setup.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Also improve docstrings.
+ IPv6Setup.py: standard import "from ipaddress import IPv6Network"
  should be placed before "from robot.api import logger"
+ MacSwap.py: Trailing newlines
+ NATUtil.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ NodePath.py: Unnecessary "else" after "return"
+ Tap.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ topology.py: Either all return statements in a function
  should return an expression, or none of them should.
+ topology.py: Unnecessary "else" after "return"
++ Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Improve docstrings
+ DUTSetup.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
++ Also do not compare int(ret_code) just to access zero-ness.
+ ssh.py: Do not use `len(SEQUENCE)` to determine if a sequence is empty
+ InterfaceUtil.py: Unnecessary "else" after "return"

Change-Id: Iba4244aa79661ee7df15fed5c7c6dbf04dfa88b2
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/resources/libraries/python/ContainerUtils.py b/resources/libraries/python/ContainerUtils.py
index 54bbdbbc04..478a9781a0 100644
--- a/resources/libraries/python/ContainerUtils.py
+++ b/resources/libraries/python/ContainerUtils.py
@@ -479,9 +479,7 @@ class ContainerEngine(object):
 class LXC(ContainerEngine):
     """LXC implementation."""
 
-    def __init__(self):
-        """Initialize LXC object."""
-        super(LXC, self).__init__()
+    # Implicit constructor is inherited.
 
     def acquire(self, force=True):
         """Acquire a privileged system object where configuration is stored.
@@ -672,9 +670,7 @@ class LXC(ContainerEngine):
 class Docker(ContainerEngine):
     """Docker implementation."""
 
-    def __init__(self):
-        """Initialize Docker object."""
-        super(Docker, self).__init__()
+    # Implicit constructor is inherited.
 
     def acquire(self, force=True):
         """Pull an image or a repository from a registry.