Import Debian changes 1:1.1.2-1+deb8u1

logback (1:1.1.2-1+deb8u1) jessie; urgency=high

  * Team upload.
  * Fix CVE-2017-5929:
    It was discovered that logback, a flexible logging library for Java, would
    deserialize data from untrusted sockets. This issue has been resolved by
    adding a whitelist to use only trusted classes. (Closes: #857343)