Uses subprocess lib to call shell command

This will prevent error in case the db name is not compatible with the shell separators

pytest_odoo.py

@@ -7,6 +7,7 @@
 import ast
 import os
 import signal
+import subprocess
 import threading
 from contextlib import contextmanager
 from unittest import mock
@@ -138,16 +139,16 @@ def _worker_db_name():
     try:
         if xdist_worker:
             db_name = f"{original_db_name}-{xdist_worker}"
-            os.system(f"dropdb {db_name} --if-exists")
-            os.system(f"createdb -T {original_db_name} {db_name}")
+            subprocess.run(["dropdb", db_name, "--if-exists"], check=True)
+            subprocess.run(["createdb", "-T", original_db_name, db_name], check=True)
             odoo.tools.config["db_name"] = db_name
             odoo.tools.config["dbfilter"] = f"^{db_name}$"
         with _shared_filestore(original_db_name, db_name):
             yield db_name
     finally:
         if db_name != original_db_name:
             odoo.sql_db.close_db(db_name)
-            os.system(f"dropdb {db_name}")
+            subprocess.run(["dropdb", db_name, "--if-exists"], check=True)
             odoo.tools.config["db_name"] = original_db_name
             odoo.tools.config["dbfilter"] = f"^{original_db_name}$"