Move utilities in util directory

alembic/versions/601e9d9baa4c_add_occ_hist_occ_hist_part_functions.py

@@ -7,7 +7,7 @@ Create Date: 2017-07-06 10:52:16.161118
 """
 from alembic import op
 import sqlalchemy as sa
-from gargantext.tools.alembic import ReplaceableObject
+from gargantext.util.alembic import ReplaceableObject
 
 
 # revision identifiers, used by Alembic.

gargantext/management/commands/nodes.py

 from django.core.management.base import BaseCommand, CommandError
-from gargantext.tools.show_nodes import tree_show, nodes
+from gargantext.util.show_nodes import tree_show, nodes
 import colorama
 
 

gargantext/tools/show_nodes.py → gargantext/util/show_nodes.py

 # Make this a standalone script...
-# Can be called this way: python3 gargantext/tools/show_nodes.py
+# Can be called this way: python3 gargantext/util/show_nodes.py
 
 import os
 import django