Security update for dovecot22

This update for dovecot22 fixes the following issues:

Security issue fixed:

- CVE-2017-15130: Fixed a potential denial of service via TLS SNI config
lookups, which would slow the process down and could have led to exhaustive
memory allocation and/or process restarts (bsc#1082828)

This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#1082828
VUL-0: CVE-2017-15130: dovecot22: TLS SNI config lookups are inefficient and can be used for DoS
Selected Binaries
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