Re-enable important py3k checks for openstack-armada-app

Re-enabling some of the disabled tox warnings present on
the pylint.rc file
Re-enabling:
W1646: invalid-str-codec

Story: 2006796
Task: 43329
Signed-off-by: Bernardo Decco <bernardo.deccodesiqueira@windriver.com>
Change-Id: I2fdb91154510e839cab4804a5ef223f2cdd58cec

python-k8sapp-openstack/k8sapp_openstack/k8sapp_openstack/helm/openstack.py

@@ -5,6 +5,7 @@
 #
 
 from eventlet.green import subprocess
+import base64
 import keyring
 import os
 
@@ -602,7 +603,7 @@ class OpenstackBaseHelm(base.BaseHelm):
             kube = kubernetes.KubeOperator()
             keyring = kube.kube_get_secret(constants.K8S_RBD_PROV_ADMIN_SECRET_NAME,
                  common.HELM_NS_STORAGE_PROVISIONER)
-            return keyring.data['key'].decode('base64', 'strict')
+            return base64.b64decode(keyring.data['key']).decode('utf-8')
         except Exception:
             pass
 

python-k8sapp-openstack/k8sapp_openstack/pylint.rc

@@ -171,11 +171,10 @@ enable=E1603,E1609,E1610,E1602,E1606,E1608,E1607,E1605,E1604,E1601,E1611,W1652,
 # E1121: too-many-function-args
 # Disable Python3 checkers:
 # W1618: no-absolute-import
-#  W1646: invalid-str-codec
 disable=C, R, fixme, W0101, W0105, W0106, W0107, W0108, W0110, W0123, W0150,
         W0201, W0211, W0212, W0221, W0223, W0231, W0235, W0311, W0402, W0403,
         W0404, W0603, W0612, W0613, W0621, W0622, W0631, W0632, W0701, W0703,
-        W1113, W1201, W1401, W1505, W1618, W1646,
+        W1113, W1201, W1401, W1505, W1618,
         E0213, E0401, E0604, E0633, E0701, E1102, E1120, E1121
 
 [REPORTS]

tox.ini

@@ -33,5 +33,5 @@ commands =
     {[testenv:bashate]commands}
 
 [testenv:pylint]
-basepython = python2.7
+basepython = python3
 description = Dummy environment to allow pylint to run in subdir tox