Make submit_try accept space- or comma-separated list

tools/submit_try

Index: tools/submit_try
===================================================================
--- tools/submit_try	(revision 8512)
+++ tools/submit_try	(working copy)
@@ -176,9 +176,12 @@
         Error('--bot specified multiple times.')
       if len(argv) < 1:
         Error('You must specify a builder with "--bot".')
+      botlist_firstpass_string = ''
+      while argv and not argv[0].startswith('-'):
+        botlist_firstpass_string += argv.pop(0)
+        botlist_firstpass_string += ' '
       using_bots = []
-      while argv and not argv[0].startswith('-'):
-        bot = argv.pop(0)
+      for bot in botlist_firstpass_string.replace(',', ' ').split():
         if bot == ALL_BUILDERS:
           if using_bots:
             Error('Cannot specify "all" with additional builder names.')
@@ -261,4 +264,4 @@
 
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(main())