Fix CorruptThen* nemesis (#1423)
Fix CorruptThen* nemesis (#1423)

In some braches (i.e. 2019.1) the scylla data dir permissions
are more strict, and not visiable by the centos user.

hence we need to make sure we run everything via sudo
(i.e. not globbing files in the centos user)
scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,amoskong/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,amoskong/scylla-cluster-tests,amoskong/scylla-cluster-tests,scylladb/scylla-cluster-tests,amoskong/scylla-cluster-tests,amoskong/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests