Update for ImageMagick, ImageMagick.256, Mozilla... recommended low

dovecot20: Fix Dovecot20 not starting due to missing ssl_keys

This update removes references to non-existent ssl_cert and
ssl_key in Dovecot configuration. (bnc#696919)

Fixed bugs
bnc#696919
Dovecot doesnt start: ssl_keys/ssl_cert defined, but no files are available
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