gcontacts synclet gets stuck, repeating "delaying gcontacts/contacts"

[mdz]

Originally described in #927, but found to be a separate issue.

17 Mar 02:54:36 - verbose: delaying gcontacts/contacts
17 Mar 02:54:36 - verbose: delaying gcontacts/contacts
17 Mar 02:54:46 - verbose: delaying gcontacts/contacts
17 Mar 02:54:46 - verbose: delaying gcontacts/contacts
17 Mar 02:54:56 - verbose: delaying gcontacts/contacts
17 Mar 02:54:56 - verbose: delaying gcontacts/contacts
17 Mar 02:55:06 - verbose: delaying gcontacts/contacts

Interestingly, it seems to have more than one copy running. This seems likely to be a scheduling bug coupled with a gcontacts bug (if there was a twitter bug, it has been squashed).