[API] moved almost all network layer components to Saros Core

Due to this change the DTM currently is not aware of the configured
transport methods and therefore use all available ones.

This misbehavior will be fixed in the following patches.

Change-Id: I73260e44f487844f465e662c74290fa8686b6ceb
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1367
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>