Add annotations to pytorch/elastic

Reviewed By: shannonzhu

Differential Revision: D33955873

fbshipit-source-id: 84e9ee4bb6595ba2e4a299561845f486ceeeb552

Author: Pyre Bot Jr

aws/util.py

@@ -10,7 +10,7 @@
 import time
 
 
-def wait_for(msg, timeout=300, interval=1, print_spinner=True):
+def wait_for(msg, timeout: float = 300, interval: int = 1, print_spinner: bool = True):
     """
     for _ in wait_for("asg to provision", timeout_sec, interval_sec):
         if check_condition():.