ignore python2-specific code under python3 for pep8

The type 'long' no longer exists under python 3. The runtime execution
of the code using it in the metrics module already detects the python
version, but when the linter is run under python 3 it does not apply
the same check. Add a noqa pragma to tell the linter to ignore the
line where 'long' is referenced to avoid an error.

Change-Id: If806e6461358ea523708eceed6fdcc3dfb8d75a9
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

monasca_common/validation/metrics.py

@@ -38,7 +38,7 @@ NUMERIC_VALUES = [int, float]
 if six.PY2:
     # according to PEP537 long was renamed to int in PY3
     # need to add long, as possible value, for PY2
-    NUMERIC_VALUES += [long]
+    NUMERIC_VALUES += [long]  # noqa
 
 NUMERIC_VALUES = tuple(NUMERIC_VALUES)  # convert to tuple for instance call