py3: Replaces xrange() with range()

Since xrange has been removed in Python 3, this patch let's replace xrange()
with using the built-in range() function.range().

Change-Id: Ia028c25d6ecaea64beec0e61b15d74f5ae25e74f

trove/tests/api/limits.py

@@ -122,7 +122,7 @@ class Limits(object):
         """Test_limits_get_remaining."""
 
         limits = ()
-        for i in xrange(5):
+        for i in range(5):
             limits = self.rd_client.limits.list()
 
         d = self._get_limits_as_dict(limits)
@@ -148,7 +148,7 @@ class Limits(object):
 
         get = None
         encountered = False
-        for i in xrange(DEFAULT_RATE + 50):
+        for i in range(DEFAULT_RATE + 50):
             try:
                 limits = rd_client.limits.list()
                 d = self._get_limits_as_dict(limits)

trove/tests/unittests/api/common/test_limits.py

@@ -358,7 +358,7 @@ class LimiterTest(BaseLimitTestSuite):
 
     def _check(self, num, verb, url, username=None):
         """Check and yield results from checks."""
-        for x in xrange(num):
+        for x in range(num):
             yield self.limiter.check_for_delay(verb, url, username)[0]
 
     def _check_sum(self, num, verb, url, username=None):

trove/tests/unittests/backup/test_backup_models.py

@@ -372,7 +372,7 @@ class PaginationTests(trove_testtools.TestCase):
             'size': 2.0,
             'deleted': False
         }
-        for backup in xrange(50):
+        for backup in range(50):
             bkup_info.update({'name': 'Backup-%s' % backup})
             models.DBBackup.create(**bkup_info)
 

trove/tests/unittests/backup/test_backupagent.py

@@ -43,7 +43,7 @@ def create_fake_data():
     from random import choice
     from string import ascii_letters
 
-    return ''.join([choice(ascii_letters) for _ in xrange(1024)])
+    return ''.join([choice(ascii_letters) for _ in range(1024)])
 
 
 class MockBackup(BackupRunner):

trove/tests/unittests/guestagent/test_agent_heartbeats_models.py

@@ -128,7 +128,7 @@ class AgentHeartBeatTest(trove_testtools.TestCase):
         # create some unique records with the same version
         version = str(uuid.uuid4())
 
-        for x in xrange(5):
+        for x in range(5):
             instance_id = str(uuid.uuid4())
             heartbeat = AgentHeartBeat.create(
                 instance_id=instance_id,