Bug#472477: workaround

[Ivan Alagenchev]

Here is how I managed to work around this problem.
Do ssh-add -D to delete all your manually added keys. This also locks 
the automatically added keys, but is not much use since gnome-keyring 
will ask you to unlock them anyways when you try doing a git push.
Navigate to your ~/.ssh folder and move all your key files except the 
one you want to identify with into a separate folder called backup. If 
necessary you can also open seahorse and delete the keys from there.
Now you should be able to do git push without a problem.

Ivan