update pylint to 1.9.2

The older version of pylint being used does not work
correctly under python 3. In order to be able to
update the pylint job to run under python 3,
we need to update the tool.

Aslo fix a couple of pylint issues:

- Fix import order issues.
- Fix 'no-else-return' checks.

Added the following to the blacklist:

- inconsistent-return-statements
- catching-non-exception
- using-constant-test

Change-Id: I91a304241ebdb4d6bd15509cae8463d7b43b3c0f
Signed-off-by: Chuck Short <chucks@redhat.com>

.pylintrc

@@ -37,6 +37,9 @@ disable=
  too-many-locals,
  too-many-public-methods,
  too-many-return-statements,
+ inconsistent-return-statements,
+ catching-non-exception,
+ using-constant-test,
  too-many-statements
 
 [BASIC]

lower-constraints.txt

@@ -31,7 +31,7 @@ pbr==2.0.0
 pep8==1.5.7
 pyflakes==0.8.1
 Pygments==2.2.0
-pylint==1.4.5
+pylint==1.9.2
 python-mimeparse==1.6.0
 python-subunit==1.0.0
 pytz==2013.6

ovsdbapp/backend/ovs_idl/windows/utils.py

@@ -39,5 +39,4 @@ def avoid_blocking_call(f, *args, **kwargs):
     # loop greenlet.
     if eventlet.getcurrent().parent:
         return tpool.execute(f, *args, **kwargs)
-    else:
-        return f(*args, **kwargs)
+    return f(*args, **kwargs)

ovsdbapp/utils.py

@@ -10,9 +10,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import netaddr
 import uuid
 
+import netaddr
+
 # NOTE(twilson) Clearly these are silly, but they are good enough for now
 # I'm happy for someone to replace them with better parsing
 

test-requirements.txt

@@ -10,7 +10,7 @@ sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
-pylint==1.4.5 # GPLv2
+pylint==1.9.2 # GPLv2
 stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT