[API] added JmDNS library (c'd)

This amends commit 3004060, which added this library but did not amend
the IntelliJ meta data of Saros/Core.

Change-Id: I520a420c47fffa8e00d9c681ceeb7b1d9d52c0bc
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1576
Tested-by: Jenkins CI
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>