Bring some reliability in the eclipse and maven mixed builds

Please look at:
https://lists.opendaylight.org/pipermail/controller-dev/2013-November/002083.html
for explanation of the issue and fix provided by:
http://stackoverflow.com/questions/10208313/eclipse-auto-build-output-interacts-with-maven-command-line-build-output

Change-Id: Ie91105f5efb9448f3dff4136d9de046069ac191f
Signed-off-by: Giovanni Meo <gmeo@cisco.com>