[patch] Improve unix socket permissions

[Thomas Jarosch]

Hello together,

currently unix sockets get created by cyrus-master
with ownership of "root.root" and file mode 0777.

Attached patch makes the user, group and file mode configurable.
If nothing is specified in cyrus.conf, it defaults to CYRUS_USER
(+group of the user) and mode 660 for improved security.

Would be nice if someone on BSD / unix could give it a try
as the file mode is set via umask() instead of chmod() to
prevent a race condition during creation of the socket.
The patch runs fine with cyrus-imapd 2.3.12p2 on linux.

Cheers,
Thomas

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