Remove unused syntax for disabling file distributor, using <disableFiledistributor> now
Remove unused syntax for disabling file distributor, using <disableFiledistributor> now

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa