[BUG] GSSAPI auth doesn't work on 2.3.11

[Carlos Mogas da Silva]

Hi list!

I have a CentOS 7 server running dovecot with GSSAPI auth enabled. Version 2.3.10 was working fine
but after the upgrade to 2.3.11 it stopped working. On thing I see on the logs is that the user
field comes up empty when compared to the 2.3.10. Example:

2.3.10:
Sep 14 13:39:20 mail.r3pek.org dovecot[10189]: imap-login: Login: user=<r3pek at r3pek.org>,
method=GSSAPI, rip=xxxx, lip=2a01:4f8:1c17:61c0::1, mpid=10195, TLS,
session=<PaDSUkWvAOkgAQgY3LZuALKwbzMw3BW/>

2.3.11:
Sep 14 12:19:24 mail.r3pek.org dovecot[9264]: imap-login: Disconnected (auth failed, 1 attempts in 6
secs): user=<>, method=GSSAPI, rip=2001:818:dcb6:6e00:b2b0:6f33:30dc:15bf,
lip=2a01:4f8:1c17:61c0::1, TLS, session=<pRubNESvMuQgAQgY3LZuALKwbzMw3BW/>


Reverting back to 2.3.10 confirmed it's a 2.3.11 thing. Is there any change necessary after the
upgrade to 2.3.11 or is this really a bug?
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