Python 3 maxint compatibility

Since sys.maxint was removed in Python 3, we should be using sys.maxsize
for compatibility, according
https://docs.python.org/3.1/whatsnew/3.0.html#integers

Closes-Bug: #1405609

Change-Id: I2fdc89c64285d81a79c78dd2482f93790673c8be

rally/benchmark/context/cleanup/context.py

@@ -46,7 +46,7 @@ def setup(self):
 
 
 # NOTE(amaretskiy): Set order to run this just before UserCleanup
-@base.context(name="admin_cleanup", order=(sys.maxint - 1), hidden=True)
+@base.context(name="admin_cleanup", order=(sys.maxsize - 1), hidden=True)
 class AdminCleanup(CleanupMixin, base.Context):
     """Context class for admin resources cleanup."""
 
@@ -71,7 +71,7 @@ def cleanup(self):
 
 
 # NOTE(amaretskiy): Set maximum order to run this last
-@base.context(name="cleanup", order=sys.maxint, hidden=True)
+@base.context(name="cleanup", order=sys.maxsize, hidden=True)
 class UserCleanup(CleanupMixin, base.Context):
     """Context class for user resources cleanup."""