Test fails due to peer having rsync cron job

the 110-multi.simple test fails consistently with the peer having the rsync cron job.

Including the full output of the test run for verification:

------------------------------------------------------------------------------
ERROR: ubuntu-repository-cache::110-multi_unit.simple
[/tmp/bundletester-mqQWcL/ubuntu-repository-cache/tests/110-multi_unit.simple exit 1]
2015-12-16 18:11:47 Starting deployment of amazon
2015-12-16 18:11:47 Deploying services...
2015-12-16 18:11:48 Deploying service ubuntu-repository-cache using /tmp/charmibpm9bgc/trusty/ubuntu-repository-cache
2015-12-16 18:15:51 Adding relations...
2015-12-16 18:15:51 Exposing service 'ubuntu-repository-cache'
2015-12-16 18:15:51 Deployment complete in 244.68 seconds
2015-12-16 18:16:03,653 juju-test WARNING : test: Setup complete, waiting for startup to complete.
2015-12-16 18:16:21,471 juju-test WARNING : test: Start complete
2015-12-16 18:16:51,518 juju-test WARNING : test: PASS: Leader is not serving metadata too early
2015-12-16 18:17:21,551 juju-test WARNING : test: PASS: Leader is not serving pool too early
2015-12-16 18:17:21,551 juju-test WARNING : test: INFO: Adding 2nd unit
2015-12-16 18:39:44,335 juju-test WARNING : test: INFO: 2nd unit online
2015-12-16 18:39:47,099 juju-test WARNING : test: INFO: Leader has metadata
2015-12-16 18:43:47,228 juju-test WARNING : test: PASS: Leader is serving metadata
2015-12-16 18:43:47,666 juju-test WARNING : test: PASS: Leader is serving pool
2015-12-16 18:43:50,333 juju-test WARNING : test: INFO: Peer has metadata
2015-12-16 18:44:20,384 juju-test WARNING : test: PASS: Non-peer is serving metadata
2015-12-16 18:44:20,687 juju-test WARNING : test: PASS: Non-peer is serving pool
2015-12-16 18:44:23,128 juju-test WARNING : test: PASS: Leader has the rsync cron job
Peer has rsync cron job

PASS: 4 ERROR: 1 Total: 5 (3542.923442 sec)