Makes _PATH_CELL_SEP a public global variable

_PATH_CELL_SEP is used outside of cells.utils so it should be not be private

Change-Id: I0b06a223b50f7d90007bb44ec7897174ed836ad4

nova/cells/manager.py

@@ -407,7 +407,7 @@ class CellsManager(manager.Manager):
         """Fetch migrations applying the filters."""
         target_cell = None
         if "cell_name" in filters:
-            _path_cell_sep = cells_utils._PATH_CELL_SEP
+            _path_cell_sep = cells_utils.PATH_CELL_SEP
             target_cell = '%s%s%s' % (CONF.cells.name, _path_cell_sep,
                                       filters['cell_name'])
 

nova/cells/messaging.py

@@ -66,7 +66,7 @@ LOG = logging.getLogger(__name__)
 
 # Separator used between cell names for the 'full cell name' and routing
 # path.
-_PATH_CELL_SEP = cells_utils._PATH_CELL_SEP
+_PATH_CELL_SEP = cells_utils.PATH_CELL_SEP
 
 
 def _reverse_path(path):

nova/cells/utils.py

@@ -22,7 +22,7 @@ from nova import db
 
 # Separator used between cell names for the 'full cell name' and routing
 # path
-_PATH_CELL_SEP = '!'
+PATH_CELL_SEP = '!'
 # Separator used between cell name and item
 _CELL_ITEM_SEP = '@'
 

nova/tests/cells/fakes.py

@@ -20,8 +20,8 @@ from oslo.config import cfg
 
 from nova.cells import driver
 from nova.cells import manager as cells_manager
-from nova.cells import messaging
 from nova.cells import state as cells_state
+from nova.cells import utils as cells_utils
 import nova.db
 from nova.db import base
 from nova import exception
@@ -127,7 +127,7 @@ def _build_cell_transport_url(cur_db_id):
 def _build_cell_stub_info(test_case, our_name, parent_path, children):
     cell_db_entries = []
     cur_db_id = 1
-    sep_char = messaging._PATH_CELL_SEP
+    sep_char = cells_utils.PATH_CELL_SEP
     if parent_path:
         cell_db_entries.append(
                 dict(id=cur_db_id,

nova/tests/cells/test_cells_utils.py

@@ -83,7 +83,7 @@ class CellsUtilsTestCase(test.TestCase):
 
     def test_split_cell_and_item(self):
         path = 'australia', 'queensland', 'gold_coast'
-        cell = cells_utils._PATH_CELL_SEP.join(path)
+        cell = cells_utils.PATH_CELL_SEP.join(path)
         item = 'host_5'
         together = cells_utils.cell_with_item(cell, item)
         self.assertEqual(cells_utils._CELL_ITEM_SEP.join([cell, item]),