Add Daexim

Add Daexim

https://wiki.opendaylight.org/view/Karaf_4_migration#Step_8:_add_your_karaf_4_features_to_distribution

I've done the following validation locally to test that it seems OK:

karaf/target/assembly/bin/karaf

opendaylight-user@root>diag
opendaylight-user@root>feature:install odl-daexim-all
opendaylight-user@root>diag
opendaylight-user@root>bundle:list | grep daexim
216 | Active | 80 | 1.2.0.SNAPSHOT | daexim-akka-infoprovider-impl
217 | Active | 80 | 1.2.0.SNAPSHOT | daexim-impl
218 | Active | 80 | 1.2.0.SNAPSHOT | daexim-model
219 | Active | 80 | 1.2.0.SNAPSHOT | daexim-spi
315 | Active | 80 | 0 | ... wrap_file__daexim-impl-1.2.0-SNAPSHOT.cfg

Change-Id: Ibbedf7605a6c7c1e40d979fbaed56d673129ec03
Signed-off-by: Michael Vorburger <vorburger@redhat.com>