Move //tools/gs.py into //mojo/public/tools

mojo/tools/roll/roll_network_service.py

Index: mojo/tools/roll/roll_network_service.py
diff --git a/mojo/tools/roll/roll_network_service.py b/mojo/tools/roll/roll_network_service.py
index 2cdf31544cdc3d2c4587dfb4faecfa1aaa170ef0..a61df259268b29dc2466701f88b17a65ebfe9bfa 100755
--- a/mojo/tools/roll/roll_network_service.py
+++ b/mojo/tools/roll/roll_network_service.py
@@ -16,7 +16,7 @@ from utils import commit
 from utils import mojo_root_dir
 from utils import system
 
-sys.path.insert(0, os.path.join(mojo_root_dir, "tools"))
+sys.path.insert(0, os.path.join(mojo_root_dir, "mojo/public/tools"))
 # pylint: disable=F0401
 import gs
 
@@ -39,7 +39,9 @@ def roll(target_version):
 
   try:
     with tempfile.NamedTemporaryFile() as temp_zip_file:
-      gs.download_from_public_bucket(mojoms_gs_path, temp_zip_file.name)
+      find_depot_tools_path = os.path.join(mojo_root_dir, "tools")
+      gs.download_from_public_bucket(mojoms_gs_path, temp_zip_file.name,
+                                     find_depot_tools_path)
 
       try:
         system(["git", "rm", "-r", mojoms_path], cwd=mojo_root_dir)