fix deprecated_repair_test dtests

All the deprecated_repair_test dtests are failing on CassCI. I believe the immediate cause is some recent changes to logs and how ccm handles them, like the failures in CASSANDRA-10451 and CASSANDRA-10453. Test failures on CassCI here:

http://cassci.datastax.com/view/trunk/job/cassandra-3.0_dtest/lastCompletedBuild/testReport/deprecated_repair_test/

I'm assigning myself to track this, in case there are other failures to deal with.