Add missing imports

gns3server/controller/project.py

@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import sys
 import re
 import os
 import json
@@ -27,6 +28,7 @@ import aiohttp
 import aiofiles
 import tempfile
 import zipfile
+import pathlib
 
 from uuid import UUID, uuid4