fix(abort_repair nemesis): fix pattern of active_repair API result
fix(abort_repair nemesis): fix pattern of active_repair API result

active_repair API returns a list of repair task number, currently pattern can
only match one number. When the repair number is larger than 9,
repair_streaming_exists() can't identify the tasks.

Signed-off-by: Amos Kong <eb01d8f828a6c9a20be4534e72e049aaf41503df@scylladb.com>

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests