Remove 'inconsistent-return-statements' check from Pylint

There are several bugs in Pylint [1] [2] affecting
'inconsistent-return-statements' check. It will be temporarily
removed.

[1] pylint-dev/pylint#1782
[2] pylint-dev/pylint#1794

JIRA: YARDSTICK-911

Change-Id: Ib655ef1befdc734c646cdfb9b48f1db0ccdf676d
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

.pylintrc

@@ -69,6 +69,7 @@ disable=
  consider-merging-isinstance,
  consider-using-ternary,
  duplicate-code,
+ inconsistent-return-statements,
  interface-not-implemented,
  no-else-return,
  no-self-use,