optimize enospc test
optimize enospc test

Set timeout in waiting enospc error to avoid test stuck.

Search enospc error by checking database log inside node,
there is some cache delay in local saved database log.

Try to occupy the free space in wait loop, this helps to
trigger enospce eaily in slow workload, compaction, etc
condition.

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

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