imap proxy: Always send post-login capability to client. The original code did it only when client had used CAPABILITY command. Now it's also sent in tagged reply to login/authenticate command if the remote server didn't already add it.
imap proxy: Always send post-login capability to client.
The original code did it only when client had used CAPABILITY command. Now
it's also sent in tagged reply to login/authenticate command if the remote
server didn't already add it.

damoxc/dovecot,damoxc/dovecot,damoxc/dovecot,damoxc/dovecot,damoxc/dovecot