Bug#1124321: amavisd-new: Drop/replace libberkeleydb-perl dependency

[Bastian Germann]

Package: amavisd-new
Severity: important
Control: block 1119186 by -1

Please get rid of libberkeleydb-perl which backs the monitoring.
It can be dropped or replaced by zmq. The plan is to get rid of
the transitive dependency libdb5.3 eventually. See blocked bug.