Support authenticating with multiple accounts

[cyberduck]

af15b8d created the issue

When I try to open a new connection to a different google drive account, I still get directed to the original google drive. At the least I should get a message warning me that the email doesn't correspond with the Drive account.

I know that google drive doesn't like opening different accounts simultaneously. But I'd love to be able to do it.

[cyberduck]

@dkocher commented

Currently the access and refresh tokens stored in Keychain are reused regardless of the login name.

[cyberduck]

@dkocher commented

In 88acb70.

[cyberduck]

@dkocher commented

#9580 closed as duplicate.

[cyberduck]

@dkocher commented

#9678 closed as duplicate.