[KARAF-2119] Fix itests again by upgrading to ops4j.base 1.4.0

Signed-off-by: Andreas Pieber <anpieber@gmail.com>

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.3.x@1435501 13f79535-47bb-0310-9956-ffa450edef68