Gerrit git cl land: tell user how to abort.

R=friedman@chromium.org,andybons@chromium.org
BUG=665623

Change-Id: I419c6c01839fd761b1941fdf002fe39769cc1e17
Reviewed-on: https://chromium-review.googlesource.com/411761
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
diff --git a/git_cl.py b/git_cl.py
index 73ce7b1..19f97d5 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -2538,7 +2538,8 @@
     if differs:
       if not force:
         ask_for_data(
-            'Do you want to submit latest Gerrit patchset and bypass hooks?')
+            'Do you want to submit latest Gerrit patchset and bypass hooks?\n'
+            'Press Enter to continue, Ctrl+C to abort.')
       print('WARNING: bypassing hooks and submitting latest uploaded patchset')
     elif not bypass_hooks:
       hook_results = self.RunHook(