Standardize automatic retry and add a 15 seconds sleep to increase the chances of success

Review URL: http://codereview.chromium.org/1812001

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@46067 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/gclient_scm.py b/gclient_scm.py
index 5eddf23..40dccae 100644
--- a/gclient_scm.py
+++ b/gclient_scm.py
@@ -9,6 +9,7 @@
 import posixpath
 import re
 import subprocess
+import time
 
 import scm
 import gclient_utils
@@ -252,21 +253,22 @@
       raise gclient_utils.Error('Invalid Upstream')
 
     # Update the remotes first so we have all the refs.
-    for _ in range(3):
+    for _ in range(10):
       try:
         remote_output, remote_err = scm.GIT.Capture(
             ['remote'] + verbose + ['update'],
             self.checkout_path,
             print_error=False)
         break
-      except gclient_utils.CheckCallError, e:
+      except gclient_utils.CheckCallError:
         # Hackish but at that point, git is known to work so just checking for
         # 502 in stderr should be fine.
         if '502' in e.stderr:
           print str(e)
-          print "Retrying..."
+          print "Sleeping 15 seconds and retrying..."
+          time.sleep(15)
           continue
-        raise e
+        raise
 
     if verbose:
       print remote_output.strip()