Enhanced build script.
Enhanced build script.

Enable "pipefail" and check Maven build command return code.

Change-Id: Iba70cebe49aac44f7ea79d18594ba83e8da6eba4
Signed-off-by: Jan Hilberath <14e793d896ddc8ca6911747228e86464cf420065@midokura.com>

midonet/midonet-docs,yantarou/midonet-docs,midonet/midonet-docs,midonet/midonet-docs,midonet/midonet-docs,yantarou/midonet-docs,yantarou/midonet-docs